No Cooling; Reduced Cooling; Blower Does Not Operate Or Runs Slow; Damper Doors Do Not Operate - Monaco DIPLOMAT 2004 Owner's Manual

DIPLOMAT 2004
9 •344

No Cooling:

1. Check blower is operating, A/C switch is in A/C or Max
position, temperature control is turned to Max cooling (blue
area).
2. System fuses are not blown.
3. Condenser fan is operating.
4. Check power supply to unit and grounding of system.
5. Check wiring.
6. Coolant valve is leaking.
7. Drive belt is loose or broken.
8. Compressor Clutch is inoperative, will not engage.
9. Expansion Valve is faulty or frozen.
10. Thermostat control is faulty.
11. Mode control switch is faulty.
12. Compressor is faulty.
13. Loss of refrigerant.

Reduced Cooling:

1. Coolant valve not operating correctly.
2. Air passages are obstructed.
3. Loose or worn drive belt.
4. Check blower and select switch.
5. Thermostat control valve is faulty.
6. Expansion valve is faulty.
7. Compressor is faulty.
8. Low refrigerant charge.

Blower Does Not Operate or Runs Slow:

1. Check fuses.
2. Check for loose or corroded connection.
3. Check wiring.
4. Check to ensure ignition switch is "ON."
5. Check blower and select switch.
6. Motor shaft has seized.
7. Blower wheel is out of alignment.

Damper Doors Do Not Operate:

1. Does the motorhome air tank have pressure?
2. Is the vacuum generator being powered and producing a
vacuum?
3. Check the vacuum line entering the unit for vacuum.
4. Check that the vacuum solenoid mounted on unit is receiving
power from the mode switch. If operating properly, the vacuum
solenoid will feel hot if current is engaging the solenoid.
5. Check the mode switch.
6. Check wiring.
7. Check for a pinch in the vacuum line leading to the vacuum
motor that operates the damper door in question.
ELECTRICAL SYSTEMS - CHASSIS