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Bertram31.com General Bulletin Board
Re: Norcold
Posted By: bruce In Response To: Re: Norcold (Russ Pagels,NC)
Date: Friday, 26 May 2006, at 2:30 p.m.
Russ,
There are 4 parts to a no cold.1 Cooling unit - compressor, condensor, evaporator(white aluminum inside box)and the freon charge all welded together and pre charged.
2. Power supply - inverts 12vdc to 26vac, lowers 120vac to 26vac.
3. Thermostat, some with a lite, some don't.
4. Thermistor - sensor on the condensor coil to detect overtemp and shut unit down.Some have them, some don't.
Compressor is fed 26vac on either ac or dc.
First make sure you have voltage in to the power supply and internal fuse is not blown.
Turn unit on and see if you have 26vac at the compressor leads, one push on the other screw on.
If you do, the compressor is bad.
If it is low, remove the push on lead. If it goes up then the compressor was locked up and is still bad.If the compressor sounds like it is running and not cooling, either a leak or the compressor is broken inside.
If no voltage at the compressor, if you have a thermistor, unplug it and check the ohms.
Most are about 300 on rx1 scale. Make sure you zero scale before checking.
It looks like the size of a large roach egg sack clipped to the coils.Mostly on large boxes, not on the small ones.
Check these out and if they all clear we'll check the thermostat.
One thing to look out for if you have power to the compressor leads is that the push on terminal can become loose and burn contact. Look at to see.
bruce
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