Anonymous-0
Well-known Member
Woke up to lil chilly house this am . Furnace not working . Pilot is still lit . Seems that gas valve is not working, or Tstat is not giving command to turn on . Older Century furnace . Any ideas??
- Thread starter Anonymous-0
- Start date
Allan in NE
Well-known Member
Thermocoupler?
Allan
Allan
Anonymous-0
Well-known Member
Hi Allen ,,in my limited knowledge of furnaces, I thought if thermocouple was bad , pilot would not stay lit ? yes , no maybe ? jfc,,I hate being out of my element when it comes to fixing something .
Anonymous-0
Well-known Member
Are there batteries in the thermostat?
Anonymous-0
Well-known Member
My plan so far
Verify a/c voltage to fan .
Check voltage at transformer 14 v?
jumper Tstat wires , to eliminate bad tstat ?
check for voltage at gas valve
If voltage at valve , replce valve .
Of course this happens on holiday .Suppose to go to cabin deer hunting tonight , don't think the wife is gonna let that happen , even though we have wood stove . lol
Verify a/c voltage to fan .
Check voltage at transformer 14 v?
jumper Tstat wires , to eliminate bad tstat ?
check for voltage at gas valve
If voltage at valve , replce valve .
Of course this happens on holiday .Suppose to go to cabin deer hunting tonight , don't think the wife is gonna let that happen , even though we have wood stove . lol
Anonymous-0
Well-known Member
Why are you getting rid of Tube heater ? I though tthey we supposed to be pretty good ? I thought about getting one for my shop . I have waste oil furnace , but wanted back up
rusty machinist
Member
You may want to get a second heater for the house. Like a wood stove, or pellet burner.
If your main gas furnace takes a dump it is good to have a backup until the gas furnace can get fixed.
If your main gas furnace takes a dump it is good to have a backup until the gas furnace can get fixed.
glennster
Well-known Member
i'm not a furnace expert by any means, somebody else will chime in with more knowledge, but, first check the thermostat and make sure it is calling for heat. the old style thermostats with teh spring and mercury switch sometimes stick from dust. you can try jumping the two terminals at the furnace where the 2 small thermostat wires hook up and see if it starts the main burner. also, there may be a small transformer in the furnace to power the valves. check the transformer output with a volt meter. i think they should put out 24v. is there by chance a rester button in the furnace or on the stack?
DH in Carolina
Member
Transformer should have 24 volts on secondary
High limit open?
flame roll out switch bad?
No gas.
Heat anticipator burned out in thermostat.
If not mercury bulb- could have dirty contacts on thermostat.
High limit open?
flame roll out switch bad?
No gas.
Heat anticipator burned out in thermostat.
If not mercury bulb- could have dirty contacts on thermostat.
Anonymous-0
Well-known Member
If you have a newer thermostate the barrrys might be dead.
Anonymous-0
Well-known Member
Take a volt meter and check across the terminals of the gas valve. You should have 24 volts. If you do, you probably need a gas valve. If you don't, you need to check the 24 volt transformer, the thermostat and the limit switch.
Anonymous-0
Well-known Member
Dad used to install and fix furnaces when I was little, probably the first phrase I ever learned was, "had to replace the thermocoupler". Thought that anytime something didn't work, it needed a thermocoupler.
Dave
Dave
1. It's a "Thermouple".
2. If it fails, the pilot shuts off... he says his is still burning.
3. A possible exception would be a WEAK thermocouple on a millivolt system the produces enough power to keep the pilot "safety" engaged, but not enough to "pull in" the gas valve. NOT many of those around anymore, though!
2. If it fails, the pilot shuts off... he says his is still burning.
3. A possible exception would be a WEAK thermocouple on a millivolt system the produces enough power to keep the pilot "safety" engaged, but not enough to "pull in" the gas valve. NOT many of those around anymore, though!
Anonymous-0
Well-known Member
All of the programable thermostates have Batterys.
Lesformore
Member
I think all the possibilities have been suggested but one. Your furnace has a Fan control that turns the fan on and off as the furnace heats up and cools off. In that fan control is also a limit control switch that shuts the furnace off if it get too hot. Some of these limit switches are built to reset themselves after cool down, others are manual reset which means that if your furnace got to hot you would have reset that control before the furnace would start again. It makes sure you know there is a problem of some kind by truning off all power to the furnace.
From my experience with gas funaces and water heaters, and camper heaters, the pilot flame must heat the thermocouple, and if the pilot goes out when you release the button, the thermocouple is bad. The gas stoves that I have had with thermocouples worked the same way, if the pilot stays lit, the thermo is good. $.02
Anonymous-0
Well-known Member
Out of gas. Check the tank before you take the furnace apart.
Gerald J.
Gerald J.
The others hit about everything. The wind could have blown out the pilot with a weak thermocouple.
Get one of the those long handled butane charcoal stove lighters. Turn off , then turn the pilot button to pilot and push. Put the flame on and above the thermocouple. If gas if flowing out the gas tube coming from the valve, it will light. The flame will then heat the thermocouple and you need to hold the button in for 30 to 60 seconds. If you let go of the button and the flame goes out then the thermocouple is bad. It is a safety device made to heat up from the flame and the gas inside it expands and keeps the gas valve open.
The thermocouple is probably an 18 or 24" but you have to see how it mounts.
If the thermocouple is bad you can still use your lighter to light the pilot each time and then turn the furnace on to heat the house plenty warm. Some of those are hard to get at depending upon how deep into the furnace they are.
Get one of the those long handled butane charcoal stove lighters. Turn off , then turn the pilot button to pilot and push. Put the flame on and above the thermocouple. If gas if flowing out the gas tube coming from the valve, it will light. The flame will then heat the thermocouple and you need to hold the button in for 30 to 60 seconds. If you let go of the button and the flame goes out then the thermocouple is bad. It is a safety device made to heat up from the flame and the gas inside it expands and keeps the gas valve open.
The thermocouple is probably an 18 or 24" but you have to see how it mounts.
If the thermocouple is bad you can still use your lighter to light the pilot each time and then turn the furnace on to heat the house plenty warm. Some of those are hard to get at depending upon how deep into the furnace they are.
Jim H SW-PA
Member
Last year cost me $45.00 to remove a dead bird from my pipe going to chimney. It has an automatic damper that when calling for gas opens fully. every other time it opens it will turn opposite direction to save ware on shaft, during these cycles it has to "cycle fully" before the gas will be allowed to flow.
The bird had it blocked and wouldn't let it re open.
I knew it wasn't the thermocouple as he replaced it the year before, [ furnace just wasn't getting gas when you turned the thermostat up}] Removed the bird and it works like a champ!!
The bird had it blocked and wouldn't let it re open.
I knew it wasn't the thermocouple as he replaced it the year before, [ furnace just wasn't getting gas when you turned the thermostat up}] Removed the bird and it works like a champ!!
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