Troubleshooting - Dometic FreshJet3 Series Installation Manual

Troubleshooting

12 Troubleshooting
The following table describes common occurrences that
are not a result of defective workmanship or materials.
Problem
The product does not operate.
The product does not operate
(or operates poorly) and the
RV is connected to the motor
generator.
The product does not operate
(or operates poorly) and the RV
is connected to a power supply
by a land line.
Frost forms on the evaporator
coil, as visible through the
air inlet hole with the filter
removed.
The product does not maintain
the desired temperature.
Condensation forms on
ceilings, windows, or other
surfaces.
2
The fan is running while the
furnace is on.
For a more permanent solution to high heat gain, accessories like the Dometic outdoor patio or window awnings reduce the effects of direct sunlight.
1
2 During normal operation, this product is designed to remove a certain amount of moisture from the air, depending on the size of the space being conditioned.
The manufacturer of this unit will not be responsible for damage caused by condensation forming on ceilings, windows, or other surfaces.
26
Rooftop Air Conditioner (Air Distribution Box, Wall Thermostat Controls)
Possible cause
The circuit breaker has activated.
A fuse has blown.
The heat pump is disabled (if
equipped).
The heat mode icon is missing
from the display.
The RV is not receiving power
from the motor generator.
The RV is not receiving power
from the power supply.
The product is producing very
cold output at a very low air
speed.
The outside temperature is
relatively low.
The product is affected by the
RV's heat gain from high outdoor
temperatures or humidity.
The air contains water vapor that
is below the dew point of the
surface.
A manual fan speed is selected.
Suggested remedy
Set or reset the circuit breaker.
Replace the fuse.
The heat pump does not operate when the outside ambient
temperature is below 40 °F (4 °C).
The heat source is not selected on the dip switch.
Confirm the motor generator is running.
Confirm the motor generator is producing power.
Confirm the fuse or circuit breaker is open. Ensure the fuse
is not blown, or circuit breaker is on and not activated.
Contact the local service center.
Confirm the land line is plugged into the power supply.
Confirm the land line is properly sized for the product's
power load.
Contact the local service center.
Inspect and clean the filter.
Open the air vents and remove any obstructions.
Adjust the thermostat to a warmer setting.
Operate the product on any Fan Only setting until the coil is
free of frost.
Contact the local service center.
Park the RV in a shaded area.
Use window shades, blinds, or curtains.
Keep the windows and doors closed or minimize their use.
Avoid using heat-producing appliances inside the RV.
Operate the product in the Turbo Fan/Cool mode.
Start the product before the outside temperature increases.
Install an ambient temperature sensor.
Keep doors and windows closed when the unit is in
operation to reduce the formation of condensation.
Select Auto Fan mode.
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EN