THERMOSTAT MODEL 1FB82-261 WHEN I TURN THE THERMOSTAT UP TO 70 IT STAYS THERE FOR FEW SECONDS AND THEN REVERTS TO 62 OR 63. I HAVE CHANGED BATTERIES I HAVE ALSO TURNED THE POWER TO THE FURNACE OFF FOR A FEW SECONDS AND THEN BACK ON

check first if you have good water flow to and from heater. lift pressure release valve on inlet and allow few sec to flow, same with outlet hot water safety valve.

remove front cover from the heater, you should see your gas connection and thermostat knob.

check if gas is burning evenly and on whole surface, check for leaks on the heater and on the lines to and from the heater.

if you did not find any faults, no leaks, safety valves work correctly, check thermostats settings,

wind it down to minimal, then turn it to about 1/4 value (you did not specify model but this should do, widening arrow or numerical values ar self explanatory), lift hot water safety valve for few seconds, then open any hot water tap (faucet if you are an american...) and check if gas ignites and burns.

set thermostat to about 2/3 value and again, lift hot water safety valve for few seconds, then open any hot water tap. check if gas ignites and if water is sufficiently hot, if too hot - wind it down to say 1/2 way, if too cold, wind it till resistant and then back off a bit, DO NOT EVER LEAVE VALVE OR THERMOSTAT ON MAX!.

if none of these help - you need either, change the thermostat or heater itself.

if works - you solved the problem, close the tap, close the cover and use the system as you normally do.

i am always recommending use of insulation on the hot water system, it saves heaps of money over the life of the system.

hope this will help you - do not forget to vote... :-)

Tankless?... call service technician

Tank? clean arrestor screen, replace gas valve thermostat
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

My model is the psp511lca but it may be the same type of reset. I have a dial I turn to the "change filter" option and then press the up and down temperature buttons simultaneously and hold for a few seconds. When you turn the dial back to "run" the change filter light on the display is gone.

Remove thermostat from wall, leaving base plate on wall.
Model number appears on back of device.
Google search thermostat model in following format: Honeywell xxxx32 thermostat .pdf
Adding .pdf to search parameter will yield product manual.
Also while thermostat is off the wall, change batteries located in compartment on back of thermostat. These batteries must be changed periodically, for example each 3-4 years.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

sounds like faulty thermostat controller disconect from hw unit and try the water again if it stays on the controller is faulty if you dont mind not having controll over the temp of the water you dont need a controller to opperate the hws

change the thermal coupling to see if thats your problem, it may be. if not then you have a gas flow problem. good day !

Sounds like this is the gas regulator giving the the problems, i would call a local plumber to service this . gas and flame is very dangerous.

Hi,
Did they change the thermocaouple or the gas valve/thermostat???
My gues is that they changed the thermocouple and NOT the gas valve which also has the thermostat in it.

The gas valve is the problem... make them change that or give you a new hot water heater.

Heatman101

probly the sensor on the modul. Take and clean it off with emery cloth and then reinstall it.

it sounds like the problem may be in the boiler and not the controller itself. Do you kno which is are the two wores that are the r-w for the thermostat take and purt them together and see if the boiler stays on or shuts off like it does with the thermostat. If it does then replace the reciever. If it doesn't then you have another problem. Good Luck