20 Most Recent Honeywell TH5110D1022 Focus PRO 5000 Thermostat, Digital 1H/1C, Large Questions & Answers

Do the easy stuff first! Is this a new install or has it been working well for a time and now it is not? Is the entire unit continuing to run or just the fan? Thermostats generally turn the unit on and off when the desired temp is reached but the fan itself (not the compressor or heat strips) typically operates in 3 modes, off, on or auto. check the fan setting.

Add a comment and describe brand, type and model of product. And what this product does. Is this a thermostat?Also say if this is new installation or older installationIf you have Honeywell thermostat, then model number and AA battery are located on back of device. Replace battery.Web search your model number and include .pdf in search parameter to obtain product manual, Use Ctrl+f to word-search manual for troubleshoot section. And view manual for illustrations showing location of battery. If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

https://www.lowesprosupply.com/Catalog/Water-Heaters/Water-Heater-Parts/Gas-Valve/GAS-VALVE-FOR-AO-SMITH-WATER-HEATER-702210Looks like a good place to start. Plenty on Amazon and Ebay but I wouldn't buy them from there.

Timer setting is given of page 11 of user manual User manual Honeywell CT1501 (English - 28 pages)

replace it

Some time ago I had that happen and because of the age my repair man said it would cost too much to repair it. The problem was a worn out thermostat.

replace valve

Gas valve might be bad... The honeywell gas valve for atmospheric models is generic and can be replace without removing from heater. Following links have resources: http://waterheatertimer.org/How-to-replace-Honeywell-gas-control-valve.html http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#honeywell

try unplugging the power to the unit it should rest it

This is likely a gas valve issue. Call a repair person, it is not recommend you repair it as there is a danger of explosion.

More than likely the gas valve is defective.

Resources appear on following link: http://waterheatertimer.org/troubleshoot-gas-water-heater-thermostat.html#honeywell If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

No, the the defective valve is only on gas fireplaces and stoves, not hot water heaters.

Check the pilot is clean not a short flame so its missing the sensor. Also check flame sensor and connection .