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Troubleshooting
Problem
There is no cooling or
heating.
10 .2 Digital-Controls Troubleshooting
WARNING: ELECTRICAL SHOCK HAZARD .
The control board operates at 115 VAC or 230 VAC.
Ensure the power is off before removing the cover
of the control box. Failure to obey this warning
could result in death or serious injury.
Problem
The evaporator fan is
not running when the
Compressor shuts off.
The evaporator fan runs
continuously at various
speeds.
The evaporator fan is
not running but the
Compressor is running.
The Q3 control
display panel is not
illuminated.
26
Possible Reason
The temperature set point is satisfied.
The condenser air flow is obstructed.
There has been a loss of refrigerant gas.
The outside temperature is too high for
efficient cooling.
The evaporator coil is iced (in cooling).
The fan is not running.
The control is in fan-only mode.
The digital control is programmed for
Cool or Aux Heat/Heat only.
The high-pressure switch is open (in
cooling) due to improper air flow.
The compressor's thermal overload is
open due to lack of air flow though the
condenser.
Possible Reason
The Q3 control is programmed for fan
cycling with the compressor.
The Q3 control is programmed for
continuous operation which is the
preferred factory default.
The circuit board failed.
There is no power to the Q3 control.
Check the control and temperature
sensor cables and connections.
The Q3 control failed.
Possible Solution
Lower or raise the set point using the Q3 control.
Check for any obstructions at the condenser. free the
condenser of any obstructions and clean the condenser if
necessary.
Check the air conditioning unit for refrigerant leaks. If leaks
are found, call a service technician for repair.
The outside air temperature will directly affect the air
conditioning unit's efficiency. This air conditioning unit can
effectively cool temperatures up to 95 °F (35 °C).
Refer to "Troubleshooting" on page 25.
• Refer to "Digital-Controls Troubleshooting" on page 26.
• Check the capacitor, connections, and motor.
• Call a qualified Dometic service technician.
Set the system for Cool Mode or for Aux Heat/Heat Mode.
Refer to "Digital-Controls Troubleshooting" on page 26.
The intake may be plugged. Verify the condenser fan
operation.
Allow the compressor to cool. Turn the system off for a while
(it may take up to three hours to reset the thermal overload).
Use this table to troubleshoot problems with the Q3
control. Refer also to "General System Troubleshooting"
on page 25.
Possible Solution
Change Programmable Function 7. Refer to "Programmable
Functions, Ranges, and Factory Defaults" on page 18.
Change Programmable Function 7. Refer to "Programmable
Functions, Ranges, and Factory Defaults" on page 18.
Send for repair or call a local service technician.
Turn the circuit breaker on.
Replace the digital or temperature sensor cables if necessary.
Contact an authorized Dometic servicing dealer for
replacing the Q3 control.
Universal Air Conditioning Unit
EN
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Table of Contents
Troubleshooting
