Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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T8000C I'm having same problem. However, can't get the unit off the wall - afraid to use too much force - can't see any locking tabs previously suggested - can u help?

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My unit snapped off - rather hard, but it came - backing plate screwed to wall stays.

My unit was fried by the power fail/surge. I have sent the bill to the power Company - but don't hold much hope they will pay for it.

Posted on Jul 13, 2008

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Pilot lights but the burner will not.


some units do not have external thermostats . its a capiliary thermmostat right on the gas valve. i suggest you gat an owners operators manual. make sure the gas control valve is in the fullly on position

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I'm looking for a replacement fan and fan motor for a Dayton model 2E454B electric wall heater.


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Need some troubleshooting tips on a fireplace. I've got the pilot on but when I flip the wall switch nothing happens.


Most of these unit are controlled with a millivolt signal that is generated from the thermopile.
We see this often at the beginning of the year.
Remove the wires from you wall switch and clean them so you have new metal showing and tighten them back to the wall switch.

With your gas valve in the on position try the switch.

If this doe not work do the same thing to the wires on the gas valve where they hook to the TP/TH connecting and the Th connection.
More information can be found at www.allpartsinc.com

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1 Answer

We own a "converted" condo unit in a building that was previously apartments and now each unit is sold as a condominium unit. I have read about others having issues with cigarette smoke coming in through...


Hello,You need makeup "fresh" air intake vent added.You have a attic fan or when a clothes dryer,range hood,bathroom fan runs it pulls the house into a vacuum or negative pressure.It will pull air from anywhere it can to balance the pressure.Try leaving a window open a little bit for a couple of days(if you can do safely)and see if it works.Then you need a outside air vent installed.I assume the AC intake/return are seprate from the neighbors.

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2 Answers

Honeywell t8000c display is blank, unit doesnt run


I would say that you have one of two issues. Either your thermostat is bad or you do not have 24v coming from the heating unit. In this case the problem would be in the low voltage circuit of the heater. At the heater you should have 24v AC when you place an electric meter across the R terminal and the C or W terminal. If you have no vaoltage across the R to either the C or W then you have a bad transformer or a blown fuse in the furnace. If you do have voltage ther and also at the t-stat then the t-stat has gone bad, replace it.

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1 Answer

Draper dhs80i space heater cutting out after 25 minutes if you turn off/on again at wall it turns back on for 10 minutes,then cuts off again any ideas what wrong thanks


Does this heater have a fan,forced heat? If so, the unit will shut down if the fan is sluggish or stops. It could be getting too hot or the rhermal safety is weak.

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2 Answers

Williams 400dvx-r nat forced air natural gas furnace


Power should be shut off at the breaker. Check with a meter before disassembling wires. The gas line gas valve will be at 90 degrees of the gas line when off, however to make sure, try and start the unit with the gas valve at 90 degrees. Remove the front cover of the unit and look for mounting bolts. From the outside, remove the vent screws. The unit should lift off its mounting bracket and slide toward you.

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1 Answer

Can someone please tell me what is the lowest temperature setting a Fahrenheat 3000 Watt Large Room Fan-Forced Wall Heater Model FZL3004 will turn on at ?


about the only way I can figure is to let the room get very cool and adjust the thermostat to its lowest setting. now turn on the unit. monitor the heat until the stat just opens. the thermostat bimetal will be closed and will open when the bimetal expands and opens its contacts. another way is to hitch up a chart recorder to measure temperature with its output connected to the heater. [too expensive for you or the DIY to accomplish]

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