In this final article, I’ll cover temperature sensors, erratic combustion and thermal switches. 5 replace gas valve this indicates a sensor failure and the gas control valve must be replaced. He has 22 years of experience in the plumbing and HVAC trades, and has a bachelor’s in business and economics from Thiel College. Water Heater Honeywell BH-777FTE User Instructions. No hot water! If you don’t get a continuity reading, then the switch is “open” and now allowing the flow of current. Put the gas control knob to the “off” position, wait a few minutes, and then try to light the pilot as normal. This leak sensor is great for stopping water or flood damage from water heaters, sump pumps, washing machines, dishwashers, sinks or toilets. Install of an AO Smith gas water heater with a Honeywell control valve. ... Sensor & Thermistor Parts Valve & Float Parts. Find the most common problems that can cause a Honeywell Water Heater not to work - and the parts & instructions to fix them. No go. Clean everything. This guide to common water heater problems covers gas and electric models from Rheem, Ruud, and other brands. 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. The pilot ignites the water heater’s gas burner. It uses a “thermopile” technology that converts thermal energy into electrical energy. Modify the temperature using the "UP" or "DOWN" arrows depending on preferences. These temperature sensors are designed to offer stable and fast linear outputs. So I figured the system should reset itself once the over temperature condition goes away. Make sure there is no flow of water through the water heater and turn the cold water supply off to the water heater. plus one turn. Honeywell WT8840A1000 - WT8840 Water Heater Gas Valve Control, NG - 1" Spud, 4" W.C. - WATER HEATER GAS VALVE, STANDING PILOT WITH PIEZO, SETPOINT 55-155F, SPUD LENGTH = 1", BRACKET= OFFSET, REGULATOR SETTING= 4" W.C., GAS TYPE=NATURAL GAS The WT8840 series is the Water Heater Control for trade use to replace WV8840 valves used in AO Smith and Bradford White Water Heaters. 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. Failure to comply with this could result in substantial property damage, severe personal injury or death. The root of the problem may be the Honeywell thermostat that comes standard on these water heaters. The water heater is a 40 Gallon Whirlpool N40T121-403. ... Water heater too hot. Again, if you want a safe setting, you should choose a setting which has temperature at 120 degrees. Test System by Increasing the Temperature. Set the thermostat or the device's controller slightly above the current room temperature. However, if problems arise, you might have to engage on a Honeywell thermostat troubleshooting crusade. When this happens, the gas valve closes, extinguishes the pilot light and your water heater stops heating water. Look up the manufacturer’s chart for sensor resistance at various temperatures and figure out what your resistance reading should be. It’s composed of serveral thermocouples connected in series to create roughly 350 mV of energy. Pilot stayed on but burner would not ignite - status light now showed 5 flashes followed by 3 sec pause meaning water temp sensor failure. Water temp sensor is located on back of this gas valve unit. Don’t let the thought discourage you, though. 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. When you take the burner assembly out, remember that some of the nuts may be reverse thread. Five flashes every three seconds indicates an internal sensor failure. You just need to turn on the thermostat to the heat position. Before you get into how to test the temperature sensor, try power cycling the unit. Restore power and then allow the water heater to run a system diagnostic. The Honeywell gas valve went into “High Temperature Shutdown” mode. Rheem water heater troubleshooting allows you to find pressure relief valve to some common issues or indicates professional repair or replacement is needed. Make sure the igniter and flame rod ceramic insulator is not cracked or broken. Because you want to test the heat, it is better to set the temperature as higher as it can. Before you get into how to test the temperature sensor, try power cycling the unit. Get Residential Plumbing articles, news and videos right in your inbox! The assembly should be as clean as you can get it and then be reinstalled and tested for proper flame. The Honeywell gas valve has a front, middle and back with temperature sensor and piezo ignitor connections in between. If all else fails, the heating element may be failing, and needs to be replaced. The author provides some more troubleshooting and repair tips in the final installment of this four-part series. What else could it be? I even flushed some of water out to get the sediments out as it’s a source of heat barrier that contributes to overheating. The system kept coming back with 4 flashes. Drain about 4 to 5 gallons of water out of the drain valve at the bottom of the water heater and throw it out. Trade Water Heater Controls APPLICATION The WT8840 Water Heater Control is designed for use in Standing Pilot applications using an immersion well for water temperature sensing. I googled around and came across this website by Tyler Tork. The Aquastat uses an immersion system that has two switches controlling the high and low temperature limits on the heater. Press the "HOT WATER TEMPERATURE" button. RTD (Resistance Temperature Detector) Sensing Elements: Platinum-based RTDs are laser-trimmed for accuracy and flexibility. It may be necessary to temper incoming water supply. Along with straightforward management software, their products adapt well to your indoor climate demands. Accurate and interchangeable, they have plastic or ceramic, miniaturized or surface mount housings (including printed circuit board termination). Think through why it could overheat. 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. Shut off the power and then check the igniter for broken or disconnected wires. If the unit doesn’t come on and still codes, then you need to take the gas valve apart. Comments on this site are submitted by users and are not endorsed by nor do they reflect the views or opinions of COLE Publishing, Inc. There are two types of burners — steel and cast iron. ... (Locating the Water Heater) continued- Water heater corrosion and component failure can be caused by the heating and breakdown of airborne chemical vapors. Do what you need to do to disassemble the valve but leave the sensor plugged into the back plate. 2. 3 possible causes and potential solutions . 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