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I have three heat zones in my home, two upstairs and one in th basement. I recently upgraded my old mercury Honeywell thermostat upstairs to a digital type CT8775A. They are connected to Honeywel motorized valves at the boiler, type V8043E1012. When I installed the thermostats I was careful to map the wiring an everything seemed fine, the digital display came up, the room temp wa monitored and the backlight was working fine. However, now that I a starting to need the heat the problem occurs. When the room is abov the temp of the thermostat setting everything is fine and the displa works.

Ameritron 10 Meter Mods Pdf To Jpg on this page. When I raise the temp setting on the thermostat to turn th heating on, and after the furnace has fired up, the display goes blank the backlight doesn't work but the furnace continues to burn. When th furnace switches off afet a couple of minutes the display reappears only to disappear again. I have tested the wiring connections at the boiler and behind th thermostat and they are all good. I have manually overridden the valv and tested the motor which appears to spin up OK.

I don't know where t look next. Has anyone else had the same problem or can anyone sugges what the problem might be. I have three heat zones in my home, two upstairs and one in the basement.

I recently upgraded my old mercury Honeywell thermostats upstairs to a digital type CT8775A. They are connected to Honeywell motorized valves at the boiler, type V8043E1012. When I installed the thermostats I was careful to map the wiring and everything seemed fine, the digital display came up, the room temp was monitored and the backlight was working fine. However, now that I am starting to need the heat the problem occurs. When the room is above the temp of the thermostat setting everything is fine and the display works. When I raise the temp setting on the thermostat to turn the heating on, and after the furnace has fired up, the display goes blank, the backlight doesn't work but the furnace continues to burn.

When the furnace switches off afet a couple of minutes the display reappears, only to disappear again. I have tested the wiring connections at the boiler and behind the thermostat and they are all good. I have manually overridden the valve and tested the motor which appears to spin up OK. I don't know where to look next.

Has anyone else had the same problem or can anyone suggest what the problem might be? Thanks for the replies so far. I have checked out the following a suggested: The wiring instructions for the thermostat do not show requirement for a ground at the terminals, and it does not require battery. Sweet Dreams Kristen Ashley Epub Bud Harry there.

An identical thermostat unit installed on the bedroom zone i working correctly. The transformer is rated at 24V so that ratin should be fine with these thermostats.

I have been monitoring excatl what seems to be happening: The display is on and showing the curren room temperature. When I turn the dial to set the heat temp I want fo the room the flame symbol appears and a few moments later the furnac fires up. After a short period of time the furnace cuts off, and afte another short period the valve closes. When the valve closes, that i when the display shuts off. Several minutes later the display come back on the valve has reopened, the room is not yet at the requeste temperature, and the furnace may fire up again. After a short perio of time again when the valve closes the display disappears again. Thi continues until either I switch the required setting to below th current room temperature, or when the room reaches the heat setting.

Tried swapping the front panel from the bedroom zone, and the same thin happens. I am trying to determine whether the fault lies with the valv which is a few years old (not sure quite how old), or whether there is fault with the thermostat before I go to the expense of replacing one o the other. Your suggestions are most welcome. Thanks for the replies so far.

I have checked out the following as suggested: The wiring instructions for the thermostat do not show a requirement for a ground at the terminals, and it does not require a battery. An identical thermostat unit installed on the bedroom zone is working correctly. The transformer is rated at 24V so that rating should be fine with these thermostats. Samsung Programs Downloads. I have been monitoring excatly what seems to be happening: The display is on and showing the current room temperature. When I turn the dial to set the heat temp I want for the room the flame symbol appears and a few moments later the furnace fires up. After a short period of time the furnace cuts off, and after another short period the valve closes.