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Posted: 10/5/2004 11:58:11 PM EST
[Last Edit: 10/6/2004 3:58:59 PM EST by Mugzilla]
The house was 60° yesterday when I got home frmo work. I Kicked the thermostat over to "HEAT". The furnace turned on, and the house heated up.

Just woke up @ 4:30 AM, and the house is FKING FREEZING!!! IT is 58°F in here!

#1 I need a new filter in my cold air return in my furnace.
#2 I took the cover off of the thermostat, and I can cycle the thermostat and see the mercury switch do it's thing.
#3 Pilot light is burning.
#4 Gas is on.
#5 No breakers are tripped.

WTF! Any furnace guys here?



<We don't have the F-word, or any variations, in thread titles. Thanks>
Link Posted: 10/6/2004 12:00:53 AM EST
Yeah, it's called a "blanket". Now do what your avatar says and go back to bed.
Link Posted: 10/6/2004 12:07:03 AM EST
Blower not working?
Link Posted: 10/6/2004 12:10:29 AM EST

Originally Posted By MrClean4Hire:
Blower not working?



Nope, the blower DOES work, when I click it to ON. It is set on AUTO right now...
Link Posted: 10/6/2004 12:11:20 AM EST

Originally Posted By MrClean4Hire:
Blower not working?



Hard to get frozen pie to do that
Link Posted: 10/6/2004 12:19:18 AM EST
Can anyone else chime in with some troubleshooting stuff I can look at before I have to call the furnace guy?
Link Posted: 10/6/2004 12:34:42 AM EST
If the blower is working I don't know. Can you feel air coming out even if its cold?
Link Posted: 10/6/2004 1:44:23 AM EST
[Last Edit: 10/6/2004 1:56:34 AM EST by luger355]
well back in HS i took two years of HVAC traning at the local trade school. Back then i thought that was the thing to be. Before i actualy got my hands dirty in the business anyway.

id take a guess since you said that mechanicaly everything is working
that your thermostat is screwy.

if your hard up for heat it is possible to hard wire the furnace to run continually.
But i dont recomend it unless your willing to babysit your machine.

Link Posted: 10/6/2004 1:54:07 AM EST
I think I have it troubleshot down to the relay that the thermostat kicks on/off. You can't make a mercury switch NOT open and close...

Thanks all!
Link Posted: 10/6/2004 1:56:45 AM EST
Hi limit control? Some are manual reset. Flame roll out switch? These are often a fuse like device. IF you have a VOM it should be easy.....
Link Posted: 10/6/2004 1:58:26 AM EST

Originally Posted By Mugzilla:
I think I have it troubleshot down to the relay that the thermostat kicks on/off. You can't make a mercury switch NOT open and close...

Thanks all!




i was right, that will be $75 dollars (luger355's heating&cooling standard service fee)
Link Posted: 10/6/2004 12:31:19 PM EST
First thing is replace the batteries in the t-stat.

GunLvr
Link Posted: 10/6/2004 12:36:29 PM EST

Originally Posted By GunLvrPHD:
First thing is replace the batteries in the t-stat.

GunLvr



Most thermostats that use mercury switches aren't running on batteries, in my experience at least.
Link Posted: 10/6/2004 12:39:16 PM EST
Is your chimney clogged with leaves?
If the furnace cannot vent it will kick off and need to be reset.
That one cost me $100!
Link Posted: 10/6/2004 2:19:40 PM EST
Gas valves do stick and go bad. Got power to it ? Cheap VOMs from electronics stores are ok for checking 24vac.

Rip
Link Posted: 10/6/2004 2:30:47 PM EST
When the batteries in my "new and improved" thermostat go south, I leave home all warm and fuzzy. Then come home to a COLD house, I'm pissed! I have to install new batteries to get HEAT, WTF?

Hope you get yours straightened out.

Danny
Link Posted: 10/6/2004 3:11:55 PM EST
Thermo Coupler is a good start
Link Posted: 10/6/2004 3:21:55 PM EST
check for reset switch in the furnace.
if your thermastat is a two wire just short them at tthe furnace and see if the furnace lights. CAUTION USE AT OWN RISK

If the furnace has a blower on the chimny(typ. in chimny that goes out the side of the house) if it goes bad the furnace won't work. found out the hard way $160
Link Posted: 10/6/2004 3:23:00 PM EST
Bad thermocouple will cause pilot to go out.


I HATE battery "whiz bang" thermostats!! Just use the tried and true T-87 doorknob.
Link Posted: 10/6/2004 3:30:33 PM EST
Blow out the coil spring thing-e thats hooked to the mecury filled class bulb.

Does the heater kick on like it should when you manually move the mercury
back and forth ?
Link Posted: 10/6/2004 3:32:44 PM EST
[Last Edit: 10/6/2004 3:35:12 PM EST by ARs4EVER]

Originally Posted By MickeyMouse:
Hi limit control? Some are manual reset. Flame roll out switch? These are often a fuse like device. IF you have a VOM it should be easy.....



Duh...if it was a roll out switch the unit will not restart.

I need more info. Brand name, split system or self contained, how old is unit, is it vented with metal B vent or PVC, what type of T-stat ie digital or mercury type. How long since service or coil cleaning?

Hasn't been a job yet I was unable to fix.

Rick
Link Posted: 10/6/2004 3:37:32 PM EST
I had to replace the thermocouple in my family's heater also, I did it myself. I needed a flare nut wrench, a screw starter, and 5 minutes to remove and replace, $15 including tax. The big problem I had was to chase the part down, no body that I went to had the part in stock. I searched high & low for a replacement, and it took like 2 days to special order the unit.
Link Posted: 10/6/2004 3:58:47 PM EST

Originally Posted By rpd_fire:
check for reset switch in the furnace.
if your thermastat is a two wire just short them at tthe furnace and see if the furnace lights. CAUTION USE AT OWN RISK

If the furnace has a blower on the chimny(typ. in chimny that goes out the side of the house) if it goes bad the furnace won't work. found out the hard way $160



DING DING DING!!!

The filter was clogged, causing an overtemperature condition inside of the furnace. There was a little hidden reset butto ninside.

$70 for a big dude to push the reset button and a new filter.
Link Posted: 10/6/2004 4:06:16 PM EST
It's just October. What in the world are y'all turning the furnace on for? My AC just kicked on fer cry'n out loud!
Link Posted: 10/6/2004 4:15:55 PM EST

Originally Posted By DPeacher:
It's just October. What in the world are y'all turning the furnace on for? My AC just kicked on fer cry'n out loud!





My same thought. As soon as I read that, I checked where Mugzilla's from. 58? It hasn't been 58 around here since when? Feburary?
Link Posted: 10/6/2004 4:17:03 PM EST

Originally Posted By Zhukov:

Originally Posted By DPeacher:
It's just October. What in the world are y'all turning the furnace on for? My AC just kicked on fer cry'n out loud!





My same thought. As soon as I read that, I checked where Mugzilla's from. 58? It hasn't been 58 around here since when? Feburary?



Ahem, fuck you. It was 55 degrees here when I left for work this morning.
Link Posted: 10/6/2004 8:10:29 PM EST
Damn, I'm still in shorts out my way.

But it sure is nice in the morning,
shorts and coffee on the back porch.
Link Posted: 10/6/2004 8:21:31 PM EST
I am an HVAC guy,

$90.00 to knock on the door. It's is all about airflow.

But.... you said the pilot was on? So it's called a standing pilot which uses a thermocouple to maintain itself through the gas valve. But now the t-stat calls for heat, 24v goes to what? A control box? Relay board? Some of the different brands use different controls but basically the safety loop is a series circuit through the flame rollout, hi limit and, if equipped with forced draft, the pressure switch.
If there is an open circuit in this loop, the fan should run full time and furnace won't start.

Railgun.... @/C Eddie.....
Link Posted: 10/6/2004 8:43:57 PM EST
[Last Edit: 10/6/2004 8:44:54 PM EST by HABU]

Originally Posted By chrome1:

Originally Posted By MrClean4Hire:
Blower not working?



Hard to get frozen pie to do that



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