Floor furnace won't stay on with pilot lit...?
March 21st, 2010These furnaces can be self generating using a thermopile ( kind of like a giant thermocouple) or a transformer.
The self generating type uses a very small current to make things work so very tight, clean connections are important. You will bneed to get a thermostat that does not have a heat anticipator for this type of system. Look for one that is compatible with a milivolt system.
The transformer type is in general treated the same as a forced air furnace. It just doesn't have a blower.
Like another answer stated could be a high temp sensor that is kicking but sounds like a control issue to me ...if you are able to do so go to the furnace itself and take the thermostat wire loose , one wire will hook to the valve connections and the other will hook to another terminal or wire, "jump" the connection from the non gas valve side of the wire to the place on the gas valve that the other tstat wire connects to with a wire (bypassing the thermostat wire and thermostat) to see if it fires and if it does check all your connections to the thermostat. If it does not work after you check the wires then may be the thermostat but you stated that it didn't fire when you touched the wires together so a tstat or gas valve issue would be last thing I would look for.
I am not sure what you mean by "floor furnace", but read on:
The furnace could be kicking out on a high temperature limit switch(overheating). When you replaced the wiring you may have inadvertently reset the high limit or it had just been off long enough for it to cool enough to reset itself. Some have to be reset manually and some reset automatically when they cool.
Make sure your furnace filter is clean and also make sure that your fan is working. Usually the burner kicks on for about 30 seconds before the fan. Once the heat exchanger is warmed up the fan kicks on. If the fan doesn't kick on the furnace overheats and kicks off the gas supply to the burner on a "high limit" safety control. It could also kick out on that same safety if the filter is clogged and their is not enough air flow even thought the fan does come on.
There are several reasons the fan might not be working. It could be a capacitor. The motor could be shot. The relay or control that turns the fan on could be bad.
Usually the red wire is the common 24 volt wire on a thermostat. When it is connected to the white wire (or the wire that was connected to the W terminal) then the gas valve should supply gas to the burner. Those are the only 2 wires on most thermostat that control the heating mode of your furnace especially if you still have a pilot that needs to be lit manually.
I would say the transformer, thermostat, and gas valve are working. Otherwise nothing would have ever lit. You are overheating. You are too hot!
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