COLEMAN 7900 SERIES FURNACE THERMOCOUPLE

It is a safety device that shuts off the gas if the pilot light goes out or the electric igniter fails. Is there a flame sensor that has gone bad? Hard to tell from the video but doesn’t look like much of a pilot. It seemed to burn a bit cleaner, but seemed to take longer to fire. At first I thought there was air in the lines since they just put a gas meter in yesterday. Dont go cheap on the detector good luck -j. It also shuts off the blower when the temperature drops to a certain level after the burner has shut off. It may be restricted venting.

After many years, the magnet can get weak, in which case the gas valve needs to be replaced. Tried again, burned 35 seconds, shut down. Are you a Heating and Cooling Expert? If the thermocouple is anywhere near 10yrs old, it should be changed. Then try lighting the pilot. Probably a good idea to call someone. You probably need one to the AC, and one running the fan as well. I would think you need to try to re light the pilot light.

How To Repair Gas Furnaces.

The odds are that the pilot burner is dirty. Kevin Member Oct-8 8: Want Answer 0 Clicking this will make more experts see the question and we will remind you when it gets answered. Probably a good idea to call someone.

The mediocre repairman replaced the thermocouple and cleans the pilot without ever measuring the millivolts. Once removed, it is self-explanatory as to replacement of the thermocouple. It is a safety device that shuts off the gas if the pilot light goes out or the electric igniter fails. If you are going to keep using that old furnace, at least have it checked out by a qualified HVAC company for safety reasons.

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Burnham Alliance indirect water heater: I have to switch this to what I want, does that make sense?

Gas valves seem to be open When he installed the meter he just turned it on, waited for 5 minutes to make sure there was no drop in pressure and left.

To adjust the thermocouple, you must tighten the thermocouple nut with a thermocoupls. The hole was much smaller however.

Thermocouple or ? on Coleman furnace – Community Forums

I took the time to adjust it where it would be in the center of the pilot. I noticed his burner unit had some sort of slide collar near the front of the burner thus allowing adjustment of the flame. When the season changes, I have a switch that says “heat” and “AC” inside the panel. I scheduled a service call with a local hvac company and they are going to come look it over this week.

Thermostat wiring – I take it you have the furnace and a thermmocouple central AC? Posted on Nov 08, Here was that youtube video.

How To Repair Gas Furnaces

LOL, no buckets on my roof. Very simple fix, your pilot is dirty, and not making proper contact with the thermocouple. Still, the problem persisted. I found one online also.

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Compression tool for RG6 coax connectors? How to Diagnose a Water Heater Problem. It may be restricted venting. But fuenace the heat kicks on, it runs for a moment then just goes out, taking the pilot with it.

The gas valve has a magnet that is energized by the thermocouple and when energized, holds the gas valve open. Heard it fire up for seconds, furnace shut down and no pilot. If it’s only the fan it sounds like the fan control. The 1st step is the venter motor running, sometimes the motor will stick over the summer months, spin it manually to colemaan it.

Thermocouple or ? on Coleman furnace

I found the same collar on mine, and after reassembling the entire unit, pulling the lever on this slide collar moving furnacs toward me and the whole flame cleaned right up, burning blue and strong. If your not a tech, I would just replace the thermocouple.

With the LP orifice in, the flame burned nice and blue and the symptom of it wanting to blow out all but disappeared. Posted on Jan 11,