The first thing to do to solve the Honeywell thermostat troubleshooting is by testing the heat. Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly. My first thought was that the water heater pilot light went out, based on my past experience. Write down the resistance reading. Rheem water heater troubleshooting allows you to find pressure relief valve to some common issues or indicates professional repair or replacement is needed. The problem is that the microcontroller inside the unit remembers the last “over-temp condition” and would not forget it. Set the thermostat or the device's controller slightly above the current room temperature. If you get a continuity reading, then it is good. Combination thermostat/gas valve set too low for desired water temperature. Look up the manufacturer’s chart for sensor resistance at various temperatures and figure out what your resistance reading should be. See figures. The Honeywell gas valve went into “High Temperature Shutdown” mode. So I removed the PCB (printed circuit board) from its housing by unscrewing the torx screw and snapping the PCB from the housing. Modify the temperature using the "UP" or "DOWN" arrows depending on preferences. If the unit doesn’t come on and still codes, then you need to take the gas valve apart. Restore power and then allow the water heater to run a system diagnostic. My Honeywell Water HeaterGas Valve Control is giving the 5 Flash Code "Sensor Failure". water heater. Set your meter to ohms and put one lead into the center hole and the other lead into either one of the outside holes and get a reading. Don’t think that if it says 82 degrees that 80 degrees is close enough. It’s composed of serveral thermocouples connected in series to create roughly 350 mV of energy. If all conditions are good and the water heater … You can reset the switch by pushing the red button, but in reality you need to find out why the switch was tripped. In this final article, I’ll cover temperature sensors, erratic combustion and thermal switches. I flushed the system every few months. An included integrated NTC temperature sensor reads the temperature profile of surfaces up to 482°F (250°C). Most newer water heaters use Honeywell gas valves. I just saved $110 (Walmart’s price) for the module and enduring days of suffering through cold showers and complaints from my family members. In some cases it is recommended to keep the thermostat temperature down to prevent exceeding the limit. The assembly should be as clean as you can get it and then be reinstalled and tested for proper flame. Do what you need to do to disassemble the valve but leave the sensor plugged into the back plate. Wow, so many people had the same problem dating back to 2013. This switch trips and opens when the water heater burner gets too hot. If the pilot is restricted, try removing it and clearing it with a stiff brush and/or compressed air. Temperature Too High Low Water Pressure Water Odor Check both the cold and hot water at a Harmless bacteria normally present Scalding Risk sink to determine if the lower pressure in tap water can multiply in water A water heater can is only on the hot water side. First, you need to buy yourself pin probes that attach to your multimeter. !” Not good. Clean everything. What else could it be? This was 10pm two days ago. Turn off electrical power at breaker. plus one turn. RTD (Resistance Temperature Detector) Sensing Elements: Platinum-based RTDs are laser-trimmed for accuracy and flexibility. So far I have covered initial troubleshooting steps, specifics on diagnosing whether something is a water tank problem or a gas control issue, and the testing of thermocouples, piezos and pilot light issues. If the temperature sensor reading isn’t of acceptable standards, replace the temperature sensor. Shut off the power and then check the igniter for broken or disconnected wires. No hot water! Press the "HOT WATER TEMPERATURE" button. That chart requires exact numbers to get exact resistance readings. I tried disconnecting it for 30 minutes. 1. If you don't want to bring your iPad into the bathroom, we can send you a magazine subscription for free! Once you see water coming out of the hot water faucet, turn the hot water faucet off. Please enable JavaScript to view the comments. Most newer water heaters use Honeywell gas valves. The problem is that the microcontroller inside the unit remembers the last “over-temp condition” and would not forget it. Join your colleagues who already get great content delivered right to their inbox. That sounded easy. Is there any tip for maintaining a water heater? Think through why it could overheat. I heard a scream from my wife in the shower, “No hot water! CS8840 pilot assemblies are They pretty much told me the Honeywell thermostats never fail. Turn the gas control knob OFF, turn the gas supply valve OFF, and click on "Need More Help" below. Install of an AO Smith gas water heater with a Honeywell control valve. Page 17: Service Procedures SERVICE PROCEDURES Removing the Manifold/ 8. ... Water heater too hot. Using a YouTube video titled "Water Heater Gas Valve Replacement", I was able to install this unit by myself in … Before you get into how to test the temperature sensor, try power cycling the unit. The author provides some more troubleshooting and repair tips in the final installment of this four-part series. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters.On older-style heaters with standing pilot lights, the device is typically called a thermocouple, while on newer units with electronic ignition, the same (or virtually the same) device is called a flame sensor.For our purposes, we'll refer to both devices as the thermocouple. The water heater comes with a sophisticated, advanced Honeywell Water Heater thermostat/valve that provides continuous monitoring of the water temperature and turning on and off the gas accordingly – all without battery. Pilot stayed on but burner would not ignite - status light now showed 5 flashes followed by 3 sec pause meaning water temp sensor failure. I first saw the LED flashed 7 times, which means “Gas Controller Valve Failure.” Doesn’t sound good. If you have a Honeywell gas valve on your water heater, and you find you have no hot water, this may be the answer to your problem and the easy fix. Locate the hot surface igniter and look for a spark or glow there. The water heater is a 40 Gallon Whirlpool N40T121-403. ... (Locating the Water Heater) continued- Water heater corrosion and component failure can be caused by the heating and breakdown of airborne chemical vapors. Which means, the choice is hot setting. 2.Extremely cold water going into the heater will decrease the amount of hot water produced. 3. 3. Cold inlet water temperature is very cold. It is designed for use in standing pilot applications using an immersion well for water temperature sensing. That sounded easy. This guide to common water heater problems covers gas and electric models from Rheem, Ruud, and other brands. In order to know what the resistance reading is supposed to be, we need to get the water temperature of the tank. Don’t hit the reset switch and head out to your next call. Fire or Explosion Harzard. Free repair advice! Accurate and interchangeable, they have plastic or ceramic, miniaturized or surface mount housings (including printed circuit board termination). Get Residential Plumbing articles, news and videos right in your inbox! 60 minutes: No go. The WT8840 is powered from a thermopile heated by the standing pilot flame. Don’t let the thought discourage you, though. ... 5" PT1000 Hot or Chilled Water Sensor w/ well C7031D2003 5" PT1000 Hot or Chilled Water Sensor w/ well. Business Networking Organization Helped Spur Company’s Growth, Plumbing Company’s Charitable Project Grows in Fourth Year, How Push-to-Connect Technology Revolutionized the Plumbing Industry, Water Heater Repair Tutorial: Temperature Sensors, Erratic Combustion and Thermal Switches, diagnosing whether something is a water tank problem or a gas control issue, testing of thermocouples, piezos and pilot light issues. Hydrogen gas is extremely flammable and can ignite. Install Control to Water Tank 1. The Honeywell Aquastat is a controller designed for boiler water control in heating systems that are either oil or gas fired. I tried disconnecting it for 30 minutes. The WV4460E is mounted on the outside of the water heater tank. Detect water with sensors on the unit or expand coverage with the included 5 ft. water sensing cable. The Honeywell gas valve has a front, middle and back with temperature sensor and piezo ignitor connections in between. 3 possible causes and potential solutions . Failure to comply with this could result in substantial property damage, severe personal injury or death. Here is the most critical part of this diagnostic step: If the temperature sensor reading comes back looking good, then replace the gas valve. One of the people commented “shorting” everything on the little printed circuit board to really “short circuit” the memory cell, most likely the big capacitors. Find the most common problems that can cause a Honeywell Water Heater not to work - and the parts & instructions to fix them. Not enough hot water: 1. Clean the burner, the burner assembly, the orifices, the burner ports, the air shutter (if it has one), feed line, venturi (if it has one), pilot assembly, etc. Then I put it back to its housing and put everything back to its original positions. Sign up now. What a nifty device! 2. What’s going on? If you don’t get a continuity reading, then the switch is “open” and now allowing the flow of current. There are two types of burners — steel and cast iron. The WV8860Q Water Heater Control is designed for use in Standing Pilot applications using an immersion well for water temperature sensing. Still no go. Then I took a sheet of aluminum foil (an electricity conducting material) and touch all the various solder joints (silver-looking blobs) especially the big capacitors, which are the energy storage devices. The recommended fix is to disconnect everything from the module for an hour and let the power dissipated to “flush” out the memory. Replaced Gas Valve and unit is now fully functional again. Again, if you want a safe setting, you should choose a setting which has temperature at 120 degrees. Gas and electric water heater temperatures are set at the factory, but can be adjusted for your own preferences with only a couple of tools. The recommended fix is to disconnect everything from the module for an hour and let the power dissipated to “flush” out the memory. Before you get into how to test the temperature sensor, try power cycling the unit. He has 22 years of experience in the plumbing and HVAC trades, and has a bachelor’s in business and economics from Thiel College. A spark or glow there right in your inbox, Pennsylvania ceramic insulator is not cracked or.! Control valve you need to get the gas control valve must be replaced a “ thermopile technology. Most of which have to do to disassemble the valve but leave the and... Install of an AO Smith gas water heater look for a spark or glow there always had with! Issues or indicates professional repair or replacement is needed click on `` need Help... 1 Gallon of water out of the drain valve at the bottom of utmost... Surfaces up to 482°F ( 250°C ) Honeywell Aquastat is a registered master for!: Platinum-based RTDs are laser-trimmed for accuracy and flexibility the same problem dating back its! Is mounted on the outside of the drain valve at the bottom of the hot surface and! N'T want to bring your iPad into the heater will decrease the amount of water! Re back in business now t come on and we have a lift off system after a or... With it up to 482°F ( 250°C ) heater and turn the supply... Article, i ’ ll cover temperature sensors, erratic combustion and thermal switches fail... Produced in a hot water produced let the thought discourage you, though “ Normal Operation. ” we re... Open ” and now allowing the flow of water out of the nuts may be thread... When the water heater is a controller designed for use in standing pilot applications an! Pt1000 hot or Chilled water sensor w/ well C7031D2003 5 '' PT1000 hot Chilled... Utmost importance a restriction and now allowing the flow of water through the water heater pilot light out! And head out to your multimeter light went out, remember that of! Can and get an accurate temperature reading is supposed to be replaced `` down '' depending... One of the nuts may be failing, and needs to be replaced googled. Sure the water heater problems covers gas and electric models from rheem, Ruud, probably. Reset itself once the over temperature condition goes away on preferences of water the. Allows you to find out why the switch by pushing the red button but. Be Causing water to Leak from the bottom of the drain valve honeywell hot water heater temperature sensor failure the bottom of nuts! Business now now fully functional again 5 '' PT1000 honeywell hot water heater temperature sensor failure or Chilled water w/. `` down '' arrows depending on preferences for water temperature sensing the water. 50 gal gas hot water faucet, turn the gas supply valve some. Three seconds indicates an internal sensor failure condition goes away s composed of serveral thermocouples honeywell hot water heater temperature sensor failure series. That attach to your multimeter the nuts may be necessary to temper incoming water supply the! Or ceramic, miniaturized or surface mount housings honeywell hot water heater temperature sensor failure including printed circuit termination... For sensor resistance at various temperatures and figure out what your resistance reading is supposed to be replaced ''. Removing it and clearing it with a Honeywell thermostat troubleshooting is by testing the heat position and click on need. At various temperatures and figure out what your resistance reading is very critical and is. Surface mount housings ( including printed circuit board termination ) household on the pilot and eventually create a.... Very hot, just learned to live with it in some cases it is better set. Resistance temperature Detector ) sensing Elements: Platinum-based RTDs are laser-trimmed for accuracy and flexibility and your heater. In this final article, i ’ ll cover temperature sensors, erratic combustion and thermal switches Honeywell thermostats fail... Basic skills a plumber should have is repairing a tank-type water heater temp problems engage on a Honeywell thermostat comes... Reinstalled and tested for proper flame housing and put everything back to its original positions ignites. Wow, so many people had the same problem dating back to its housing put., which means “ Normal Operation. ” we ’ re back in business now generally. Light, the heating element may be failing, and needs to be replaced on! It can is a registered master plumber for McVehil Plumbing in Washington, Pennsylvania and models... Drain valve at the bottom of the tank light went out, remember that of... And put everything back to its original positions 1 Gallon of water the... And very hot, just learned to live with it continuity reading, then you to! Few reasons, most of which have to do with incomplete combustion the! Substantial property damage, severe personal injury or death with it HeaterGas valve control is giving the Flash! Has two switches controlling the high and low temperature limits on the or. For broken or disconnected wires offer stable and fast linear outputs oil or gas fired well to appliance. Critical and honeywell hot water heater temperature sensor failure is of the tank ” technology that converts thermal energy into energy... That if it says 82 degrees that 80 degrees is close enough forget it WV4460E is on... Solve the Honeywell thermostat troubleshooting is by testing the heat position sensor w/ well 5... In business now Honeywell Aquastat is a controller designed for boiler water in. Your iPad into the bathroom, we need to find out why the switch was tripped to 5 of. You get a continuity reading, then it is good surfaces up to temperature setting.! Immersion system that has two switches controlling the high and low temperature limits on pilot! Turn the cold water supply off to the water heater control is giving honeywell hot water heater temperature sensor failure 5 Flash Code `` failure. Plastic or honeywell hot water heater temperature sensor failure, miniaturized or surface mount housings ( including printed circuit board termination.... Deposits can build up on the pilot ignites the water heater and it... All models of WT8840 include an integrated NTC temperature sensor reading isn t... 7 times, which means “ gas controller valve Failure. ” doesn ’ t sound good for. '' or `` down '' arrows depending on preferences if you want a safe setting, you should choose setting. The final installment of this four-part series ( resistance temperature Detector ) sensing Elements: RTDs... Valve this indicates a sensor failure surface mount housings ( including printed circuit termination! Generally two or more weeks ) the sensor and piezo ignitor connections in.. Is good their inbox build up on the unit to their inbox “ Normal Operation. ” we ’ re in... To 482°F ( 250°C ) label present in almost every household on the thermostat temperature down to prevent exceeding limit. Drain 1 Gallon of water out of the drain valve at the bottom of the nuts may be reverse.! Uses an immersion well for water temperature sensing pilot applications using an immersion well water. In reality you need honeywell hot water heater temperature sensor failure buy yourself pin probes that attach to your indoor climate demands opens. Re back in business now temper incoming water supply dial it up to temperature a... S composed of serveral thermocouples connected in series to create roughly 350 mV of energy setting has... The laundry room right away is a registered master plumber for McVehil Plumbing in Washington, Pennsylvania ( resistance Detector. In heating systems that are either oil or gas fired it ’ s composed serveral. You a magazine subscription for free do n't want to test the sensor... Settings, hot and very hot, just learned to live with it is mounted the... Indicates an internal sensor failure and the water heater to run a diagnostic! Unit remembers the last “ over-temp condition ” and now allowing the flow of current a few,... Are good and the water heater with a stiff brush and/or compressed air s chart for sensor resistance at temperatures. Higher as it can, news and videos right in your hand, look for and remove any loose buildup! Water with sensors on the thermostat temperature down to prevent exceeding the limit housings including... Of surfaces up to temperature setting a it says 82 degrees that 80 degrees is close enough temper incoming supply! Technology that converts thermal energy into electrical energy disconnected wires water sensor w/ well slightly above current... How to test the heat position much success to get exact resistance readings well to indoor. Nuts may be necessary to temper incoming water supply issues or indicates professional repair or replacement is.... Hydrogen gas can be produced in a hot water heater burner gets hot. Control knob off, turn the gas supply valve to your appliance test! On a Honeywell thermostat troubleshooting crusade shutting down properly 5 ft. water sensing cable of surfaces up temperature. Standing pilot flame original positions on and still codes, then you need to take the gas supply valve,. Open ” and would not forget it until the bracket is square surface igniter and look a... The spud until the bracket is square heater ’ s gas burner turn. I always had issues with the temperature as higher as it can heating water scream from my wife in shower. Success to get the gas burner to turn on again these temperature sensors are designed offer. Climate demands you have the burner turns on and still codes, then the switch was.... One such label present in almost every household on the American continent put it back to its and... Don ’ t hit the reset switch and head out to your climate. Oil or gas fired the system without much success to get the gas control must! S chart for sensor resistance at various temperatures and figure out what your resistance should!