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Old 02-20-2007, 08:08 PM   #16
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Carrier Furnace - out cold :)


I will do this for you.......if you want to post your phone number i can call you and we can try to figure this out over the phone.

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Old 02-20-2007, 09:09 PM   #17
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Carrier Furnace - out cold :)


Send me an email direct: ffemtp@gmail.com
Once you send me the email I will send you a message with my phone number in it.... Not gonna post my number here....
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Old 02-27-2007, 07:34 PM   #18
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Carrier Furnace - out cold :)


Hi Ceddarhead

I should have elabirated a little more for you. The three wire pilot on your particular furnace controls the spark generator via the green wire and the main valve via the white wire. This particular pilot burner has a warp switch inside of it that shifts it between pilot and main burner. The switch has a tendency to stick after a period of years. That is why I suggested changing it up but reccomended trying to clean it first due to the expense. Anyway hopefully this information will help you if you still need it, if not it will help somone in the future.

Good luck
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Old 11-08-2011, 11:57 AM   #19
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I have a similar furnace, same pilot assembly number I think, printed on it is CG-730PS but all I can find that looks right is LH680005. At the start of winter the pilot was not lighting (ignitor was working though). I took out the assembly, cleaned the pilot orifice, put it back together, and it worked...for awhile. Now the burners are coming on for awhile, long enough for the blower to come on, then after awhile they go out and the blower blows until the air gets cool, burners come back on, repeat. However, this only happens sometimes, sometimes nothing happens at all. Any thoughts? These units don't have main burner flame sensors right? Just the pilot flame sensor? I don't know that these can be cleaned, they seem to be totally sealed. You can remove the ignitor and the pilot orifice but other than that it's all spot welded together.
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Old 11-08-2011, 03:41 PM   #20
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Carrier Furnace - out cold :)


is your filter clean, coz it sound to me like your furnace is cycling on the high limit
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Old 11-08-2011, 04:33 PM   #21
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is your filter clean, coz it sound to me like your furnace is cycling on the high limit
Yeah I cleaned the filter a few weeks ago and the unit wasn't run until a few days ago. Is there a way to adjust/clean/replace the limit you're referring to? Maybe it's faulty?

On a related but slightly different topic. Are there repair manuals for different HVAC units like there are cars? I can't seem to find a manual for this thing anywhere.
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Old 11-09-2011, 12:09 PM   #22
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with an almost 100 pe off on the high limit. rcent certianty, that furnace is cyclingyou need to do a tempature rise on the unit to detrmine if its a return or supply issue.If you have not been faithfull about keeping the filter cleaned on a regular basis, or if your enviroment is "dirty" you may have a plugged evaporator coil.
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Old 11-09-2011, 01:14 PM   #23
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with an almost 100 pe off on the high limit. rcent certianty, that furnace is cyclingyou need to do a tempature rise on the unit to detrmine if its a return or supply issue.If you have not been faithfull about keeping the filter cleaned on a regular basis, or if your enviroment is "dirty" you may have a plugged evaporator coil.
I have a reminder set up to clean my filter every three months and I've been doing this since I moved into the place. I can't say how good they were about cleaning it before I moved in.

I've been able to get it to work and what seems to be the problem is the pilot either doesn't light or takes awhile to light. I think the cycling is just the thermostat, when I turn it all the way up the burners and blower run continuously without any problems. My suspicion is still a dirty orifice, I'm going to replace that and see how it goes. Next in line will probably be to replace the whole pilot assembly. I'm going to check the control board as well and see how it looks then replace it if it seems questionable.

Maybe I'm just way green, but isn't the evaporator part of the A/C? I'm working on the heater...
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Old 11-09-2011, 01:22 PM   #24
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The evap coil is in the airflow typically just downstream of your furnace heat exchanger. What they are saying is that over time the fine passages in the evap coil can get blocked with dust or whatnot. This reduces the overall cfm of the system which may cause the HX to get hot enough to trip a safety.

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Maybe I'm just way green, but isn't the evaporator part of the A/C? I'm working on the heater...
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Old 11-09-2011, 01:50 PM   #25
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The evap coil is in the airflow typically just downstream of your furnace heat exchanger. What they are saying is that over time the fine passages in the evap coil can get blocked with dust or whatnot. This reduces the overall cfm of the system which may cause the HX to get hot enough to trip a safety.
Thanks! With the thermostat all the way up the unit ran for ten minutes before I shut it back off so I don't think it's the limit switch. I will see if that's dirty though as I have noticed the air at the vents doesn't seem to be as strong or hot as I'd expect. I assume you can clean them? Or do they have to be replaced?

Anybody know where a manual for these units or similar is? I can't seem to find one anywhere.
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Old 11-09-2011, 01:59 PM   #26
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Cleaning evap coil is a real PITA. I only did mine once in the 15 years it ran before I replaced it. In my case it really wasn't bad and probably didn't really need the cleaning. But some others I have seen pics of here in the forum were quite a mess. They make specific cleaning solutions for the purpose and the passages can be gently brushed out if necessary. Easy to bend the fins so must be very careful.
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Old 11-09-2011, 07:02 PM   #27
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I have a reminder set up to clean my filter every three months and I've been doing this since I moved into the place. I can't say how good they were about cleaning it before I moved in.

I've been able to get it to work and what seems to be the problem is the pilot either doesn't light or takes awhile to light. I think the cycling is just the thermostat, when I turn it all the way up the burners and blower run continuously without any problems. My suspicion is still a dirty orifice, I'm going to replace that and see how it goes. Next in line will probably be to replace the whole pilot assembly. I'm going to check the control board as well and see how it looks then replace it if it seems questionable.

Maybe I'm just way green, but isn't the evaporator part of the A/C? I'm working on the heater...

sorry for the gobeled post my lap top has a mind of its own sometimes, anyway replacing the 3 wire pilot is inexspensive and easy for a DIY"er. start with that and see if it fixes the problem.......if not then you need to start looking at air flow.
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Old 11-09-2011, 08:33 PM   #28
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Everything seems to be working fine now just from cleaning the orifice. We'll see how long it keeps working.
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Old 11-10-2011, 09:34 AM   #29
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Well that didn't last very long, stopped working again - just never came on last night. I'm assuming the pilot is not lighting, but we'll find out tonight when I have time to look at it. Any tips on getting a pilot to light consistently on these old Carriers?
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Old 03-26-2012, 09:03 AM   #30
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Did you ever solve your pilot problem? I have the same issue. Intermittently the pilot will not light even though there is ignition spark. Some times it lights immediately, some times it will spark for two or three minutes before it lights. some times it will spark for ten minutes until it goes into lock out. I have replaced the pilot safety switch and the gas valve.

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