Need replacement glass for pilot cover of Coleman Presidential II
We have an older mobile home with a Coleman Pres. II gas furnace model number 7763A series 856. The screw on cover for the pilot hole fell and the glass insert broke. This is an obsolete part and the pilot can blow out without a proper cover. We need to find someone who is replacing their furnace to sell us their old piece of glass. HELP!
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If it is a 'standing pilot' furnace and it just 'went out'...I would think you need to try to re light the pilot light. If it doesn't re-light, it is probably time for new thermocouple. Presidentials are very tricky to install a thermocouple on if you are not experienced with it or if you don't feel comfortable working with gas and electricity.
Probably should call a local 'handy-man' at the least to perform the task or a local HVAC service company.
There should be a series of phillips head screws around the perimeter of a large access panel on the front of the furnace. You'll need a 3/8" wrench for the thermocouple connection to the gas valve and a 7/16" wrench to remove the 'pilot' line off of the gas control. Look for how the pilot assembly mounts under the pancake style burner because its much easier to remove the whole pilot assembly to replace the thermocouple than just it by itself. Once removed, it is self-explanatory as to replacement of the thermocouple.
Do NOT overtighten the thermocouple connection into the gas valve as you can damage the gas valve by doing so. Make sure you leak test the pilot tube connection after it is reconnected to the gas valve. A diluted solution of dishwashing liquid dashed around the ferrule of the pilot line should show bubbles if there is a leak. No gas will be in that line unless the pilot button is depressed and/or the pilot light is lit and burning.
Is this a blend air system? If so, there is an upper & lower control board that communicate to each other, and if the exhaust fan on the roof is out, it will give you intermittent issues. The fan mixes or blends outside air with the return of the air handler, & duals to pressurize the attic. These were installed due to mobile homes built too air tight. Without this fan, your roofing shingles will curl, and your roof decking will bow prematurely.
Sounds like the flame sensor. But it could be the thermostat. Is the furnace standing pilot or electronic spark or hot surface ignition. I would start by checking thermostat. Turn power off to furnace take thermostat off wall and take wires marked r & w and connect them together. Turn power back on if furnace works then change out thermostat.Most eclectronic ignition Furnaces have a flam sensor, You could take flame sensor out and clean it up with steel wool or wire brush. If you need anymore help just reply back .
Is this furnace standing pilot or electronic ignition. If standing pilot i would check furnace filter then the thermastat. To test themostat first turn power off to furnace. Take thermostat off wall and take wires labled R & W and connect them together. If you have electronic ignition I would start with cleaning the flame sensor with steel wool or wire brush.If you have and more questions i will be glad to help.
You should have 3 wires going to the gas valve - MV(mainvalve), PV(pilot valve) and MV/PV (or Common). Make sure all of these are properly wired and tight.
You also may have a dirty FLAME SENSOR on your pilot/ignitor assembly. You may need to remove the pilot tube and the pilot assembly to clean the sensor with sandpaper.
Be careful not to damage any parts while cleaning them. Be careful not to crossthread the gas line when re-installing it.