Durotherm Model 57915.331 - not cooling properly
Yes, you should remove the upper cover and check the back side of the condenser as Duo-Therms pull air in from the sides and blow it through the coils from inside the shroud. This usually will cause the compressor to shut down, but only after running for awhile. When you notice that the unit is not cooling as well, or not at all, got up on the roof and remove the shroud, check to see if the compressor is actually running. If the compressor is shut off, the problem lies elsewhere in the system. Check to see if the compressor is cycling on and off or if once it is off it stays off.
If you have a wall thermostat control, check for 12VDC power at the yellow wire when the compressor is off. If power is present, then remove the control box from inside the inner shroud of the unit and check for power at the yellow wire in the there. If it is still present, check for 120VAC power at the compressor relay (black wire with Purple or Blue wire). If the purple or blue wire have 120VAC power, then the problem is upstairs either with start capacitor or the thermal overload (located on top of Compressor). If there is no power at the purple or blue wire, try unplugging the freeze control and jumper the connection on the board (blue connection, white wires) with a small piece of wire, if the compressor comes on and runs, then you have a bad freeze control. If not, then you have a bad control board.
If you have manual controls on the ceiling unit, you could have a bad thermostat. Unplug power from the unit and remove the two wires on the back of the thermostat. With an ohmmeter, check for continuity between the two terminals, if there is, turn the knob and watch the meter. You should not lose connection until the temperature you set is above the temp. inside the unit. If this is ok, then you need to check the selector switch. Also check the components in the upper unit as described in the above paragraph.
Hope this helps,
Jeff
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No way to edit my question. The unit is a Norcold DE461...
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