Honeywell WT8840B1000 Water Heater Gas Control Valve, NAT 160 Degree F 1" Cavity. Behind the gas valve is a well that has a temp sensor. Anthony Pacilla is a registered master plumber for McVehil Plumbing in Washington, Pennsylvania. The author provides some more troubleshooting and repair tips in the final installment of this four-part series. Then I proceeded to dial it up to temperature setting A. I first tried resetting the module by turning it to off and re-start the pilot light by turning the dial to “Pilot”, holding down “Pilot” and push the spark igniter. The recommended fix is to disconnect everything from the module for an hour and let the power dissipated to “flush” out the memory. Water temp sensor is located on back of this gas valve unit. Don’t think that if it says 82 degrees that 80 degrees is close enough. The Honeywell gas valve went into “High Temperature Shutdown” mode. Boiler … 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. 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. 5 replace gas valve this indicates a sensor failure and the gas control valve must be replaced. The first thing to do to solve the Honeywell thermostat troubleshooting is by testing the heat. Here is the most critical part of this diagnostic step: If the temperature sensor reading comes back looking good, then replace the gas valve. Zero - Controls off, pilot out normal operation would be one flash. Red LED flashes at device C. Push notification is sent to your mobile device D. Email notification is sent to the email address connected to your Honeywell Home app Often blamed on sediment in the tank, the 4 flashes is one of the most common problems with the Honeywell gas valve. by the flammable vapor sensor. In some cases it is recommended to keep the thermostat temperature down to prevent exceeding the limit. ST9420C indicates that Heating and/or Hot Water are ON. It is designed for use in standing pilot applications using an immersion well for water temperature sensing. Look up the manufacturer’s chart for sensor resistance at various temperatures and figure out what your resistance reading should be. 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. Don’t forget to set the temperature. Water: When the water leak detector or cable sensor detects water. Immediately, the burner turns on and we have a lift off! Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly. This switch trips and opens when the water heater burner gets too hot. 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. Temperature sensors used to provide space temperature sensing, and switch initiation and indication of overrides from remote location. Honeywell provides an variety of sensors which cover a variety of applications from averaging, outdoor and immersion sensors to duct-mount, strap-on and wall mount sensors. What a nifty device! He has 22 years of experience in the plumbing and HVAC trades, and has a bachelor’s in business and economics from Thiel College. This unit (Honeywell WT8840B1000) replaced my old WV8840B1042, which was throwing a "5 flash" code (Temperature sensor failure). Install of an AO Smith gas water heater with a Honeywell control valve. Once the pilot is relit, the status light will flash a code (4 flashes), indicating an over-temperature condition. CS8840 pilot assemblies are What’s going on? You just need to turn on the thermostat to the heat position. Try first! the meaning of this is temperature sensor i mean code 5 mean temperature sensor failure since yesterday the water is not consistent,but this morning when i increase to high temp,it come to normal operation. Based on the “Status Light Code,” it means “Temperature Exceeded.” It made sense as we had a heat wave recently. 4.5 out of 5 stars 890. I just saved $110 (Walmart’s price) for the module and enduring days of suffering through cold showers and complaints from my family members. Igniters and Sensors. Look for a fault again ( and clear the fault ) out of tank! Take the gas valve unit heating water with temperature sensor, their products adapt well your... 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