18
EN
Furnaces
5 DIAGNOSTIC PROCEDURES
ELECTRICAL SHOCK, FIRE, EXPLOSION, AND/OR CARBON MONOXIDE HAZARD. Use only
Dometic replacement parts and components, which are specifically approved for use with the Furnace. Failure to
obey this warning could result in death or serious injury.
This section has information to help you identify a range of furnace problems by diagnosing individual
component parts. Remember to check the basics before replacing any parts, such as loose wiring and overall
heating issues. Refer to the Maintenance (on page 41) and Heating Issues (on page 26) sections for more
detail.
Component Diagnostic Question Action Based On Status Page
Air Conditioner (AC) Board/Thermostats
ZONE
MODE
PROGRAM DEHUMIDIFY
OUTSIDE
TEMP
INSIDE
TEMP
°F / °CCLOCK
FAN
When the thermostat calls for
heat, does the relay on the AC
board close (to create continuity
and complete the circuit) and send
power to the thermostat terminal
on the furnace board (or external
relay depending on the model)?
When the thermostat is calling for
heat, check for continuity at the AC
control board or thermostat where
the two furnace wires connect. To
diagnose if the issue is with the
AC board/thermostat or with the
furnace, bypass the furnace wires at
the thermostat:
• If the furnace ignites and
heats, the problem is with the
thermostat or the AC control
board
• If the furnace does not run, the
problem is with the furnace
• If no continuity is present, the
AC board is bad and requires
replacement
Refer to the appropriate furnace
sequence of operation/wiring
diagrams to get error code details
9
I
Heat/Cool thermostats are commonly used with air conditioners
and Dometic furnaces. The warranty, installation instructions, and
diagnostic information are provided by the manufacturer of the
thermostat, and not by Dometic.
Blower Wheel
Inspect the blower wheel. Is the
blower wheel dirty (dust, pet hair,
etc.)?
Yes = Perform maintenance 41
Inspect the blower wheel. Is there
visible damage?
Yes = Replace the blower wheel 31
Is the blower wheel turning? No = Run tests on the motor 23
Is the blower vibrating or noisy? Yes =
• Confirm that there are no loose
objects (screws, etc.) within the
wheel
• Replace the blower wheel, if
necessary
31
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