Monaco LaPalma - Page 335

8 • 335
Electrical Systems
2004 • LaPalma
No Cooling:
• Check blower is operating, A/C switch is in A/C or Max position, temperature control is
turned to max cooling (blue area).
• System fuses are not blown.
• Condenser fan is operating.
• Check power supply to unit and grounding of system.
• Check wiring.
• Coolant valve leaking.
• Drive belt loose or broken.
• Compressor Clutch inoperative, will not engage.
• Expansion Valve faulty or frozen.
• Thermostat control faulty.
• Mode control switch faulty.
• Compressor faulty.
• Loss of refrigerant.
Reduced cooling:
• Coolant valve not operating correctly.
• Air passages obstructed.
• Loose or worn drive belt.
• Check blower and select switch.
• Thermostat control valve faulty.
• Expansion valve faulty.
• Compressor faulty.
• Low refrigerant charge.
Blower Does Not Operate or Runs Slow:
• Check fuses.
• Check for loose or corroded connection.
• Check wiring.
• Check ignition switch is “ON.”
• Check blower and select switch.
• Motor shaft seized.
• Blower wheel out of alignment.
Damper Doors Do Not Operate:
• Does motorhome air tank have pressure?
• Check vacuum generator is being powered and producing vacuum.
• Check vacuum line entering unit for vacuum.
• 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.
• Check mode switch.
• Check wiring.
• Check for pinched vacuum line leading to the vacuum motor operating the damper door in
question.