42
EN
Furnaces
Gas Valve
➤ Clean the orifice.
I
The orifice must be removed before cleaning.
– Refer to Servicing the gas valve (on page
39) for the details on reaching the orifice.
– Soak the orifice in carburetor cleaner or an
alcohol-based solvent.
– Use a toothpick or other non-metal instrument
to clear any debris from the orifice.
Gaskets
➤ Inspect all gaskets for tight seals.
➤ Replace any damaged or loose gaskets; never
reuse gaskets.
Support
➤ Ensure that the furnace’s physical support structure
is solid, with no signs of sagging, cracks, or gaps.
Motor
I
The motor is lubricated and permanently
sealed. It requires no oiling, and no internal
parts can be repaired.
➤ Replace the motor if it fails or is defective, emitting
abnormal noises, etc.
➤ Refer to Servicing the motor (on page 36)
Return Air
➤ Clean and clear the return air passageways of any
obstructions.
➤ Ensure that the passages meet the minimum
square inches for the unit, as specified in the
installation instructions.
➤ Clear away any combustibles or other items that
are stored around or near the furnace.
➤ Refer to Heating Issues (on page 26).
Sail Switch
➤ Clear obstructions around the sail switch.
➤ Make sure the paddle closes and/or is not stuck
closed.
➤ Clean any wire connections or connectors
attached to the switch using contact cleaner.
➤ Refer to Servicing the sail switch (on page 38).
Venting
➤ Inspect the vent for any debris or obstructions, and
clean if necessary.
➤ Check the dra cap assembly for proper overlap.
The vent tube should be inserted into the
combustion tube a minimum of 1-1/4" (32 mm).
The dra cap assembly must be positioned against
the door screen for proper function (85/89
models only).
➤ Any air leakage at vent joints may cause improper
combustion.
➤ Clean the exhaust tube.
Voltage
➤ Use the multimeter to check the voltage coming
into the unit. The voltage must be between 10.5
and 13.5 VDC during operation. Check the
voltage at the generator, battery, and converter to
ensure it is within specifications.
➤ Low voltage can cause the furnace to overheat and
cycle. Clean the circuit board ground connections
using a non-metal instrument and carburetor
cleaner, as necessary.
➤ High voltage can cause unbalanced combustion,
and excessive motor wear. Replace the motor
when it is worn.
➤ Refer to Heating Issues (on page 26).
I
To increase motor life, the furnace should be
wired directly through the battery.
Wire Connections
➤ Check the furnace for loose or disconnected
wires.
➤ Reattach or tighten connections as necessary.
➤ Check for improper grounding or dirty edge
connectors.
➤ Clean the circuit board ground connections using
a non-metal instrument and carburetor cleaner.
Ventilator Board
➤ Check the ventilator board wiring for loose or
disconnected wires.
➤ Make sure the three connectors and harness are
secured to the board and are functional.
➤ Inspect the board for any visible damage. Replace
the board if it is damaged.
>> Return to Operational Issues and Diagnostics
To Next Page
Loading...
Need help?
General
