Sometimes enough heat is generated by the sun beating on the roof stack to cause enough heat build up in the heat exchanger to cause the fan switch to turn the blower on. The fan switches used in furnaces these days are set to come on at fairly low temps, 115-125 degrees. Your switch may be getting ...

You don't say whether it is a double wide or single wide home, also assuming a split system ac. Could be a crossover over duct had either fallen off or been torn up by critters. Pull some skirting when the fan is running, if you getting "real" good air flow at the opening this could be you...

Some of the older homes have a 3/4" cold feeding into a 1/2" manifold or series of 1/2" tees feeding the cold faucets throughout the home. I suspect construction debris caught at the inlet side of that manifold. You could cut the 3/4" line below that and hope whatever it is just ...

Check for low voltage, 24v ac, at the control valve. If voltage is there you may have a bad control. No voltage, could have a bad limit someplace. Best to have it checked out by a service company.

Was the furnace set up properly to run LP gas?

Even if you get it out of it's alcove you won't have room to work around it. Those are usually set in place then the walls are built around them. The only ones I have run into like that we cut up and trashed. Installed new tub complete with surround. Real familiar with those units as Admiration in o...

Here is a link to a replacement unit. http://americanhvacparts.com/Merchant2/ ... opeland-cr
Your model # shows up in the series of compressors this one replaces. 3.5-4 ton.

homebuff, plug that 3 light tester into the outlet you have lost the neutral on. The tester usually has a troubleshooting chart on it. When you get the light configuration that shows an open neutral start shutting down breakers until you get the right one, evidenced by all the lights on the tester g...

Along with my other response: Pex tubing being used for a main supply. Most towns near me require 3/4" copper tubing for a main water supply. Heat tape is also slightly overlapping itself. Most tapes of that nature require they not overlap or touch a previous wrap. Probably not a good idea not ...

Heat tape wrapped too close together.
No insulation on line over heat tape.
Line lying on ground/unsupported.
No cover on vault/riser.
Hard to tell from pic but that may be a thermostat wrapped under heat tape. (lower right in pic)