Rheem 96P series Installation Instructions Manual page 98

TABLE 20 (continued)
90P 2 STAGE FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS
STATUS: This is a critical fault. The furnace will not operate in any mode.
DESCRIPTION: The blower has failed critically or there is a critical motor fault - such as thermal limit trip that prevents the
blower motor from running.
EXPECTED OPERATION: If the furnace was in heating operation when this fault occurred, blower operation will immediately
stop and the furnace will shut down normally with post-purge at the correct speed. After the post purge (or immediately if no
heat call was present), no other operation (including thermostat calls) will occur until this fault is cleared.
This fault may be displayed in heating or cooling modes and may also be displayed in heating mode after the main limit control
has been opened four times consecutively for more than 150 seconds (2m:30sec) each time. If this happens, the IFC
determines that the motor and/or blower is not functional and enters a hard lockout condition requiring repair of the blower/motor
and manual reset of power to the furnace.
CAUSE:
61
(1) The motor has tripped on thermal limit because of a restriction or bearing failure.
(2) The motor Power Factor Correction (P.F.C.) choke is faulty and needs replacing.
(3) The furnace model data is faulty or corrupted.
(4) Wiring to the motor and/or P.F.C. has become compromised.
(5) The blower wheel has become damaged or is not properly attached to the motor shaft.
(6) The motor has failed catastrophically.
SOLUTION:
(1) Remove obstruction or replace motor.
(2) Replace the Power Factor Correction choke.
(3) Replace the furnace memory card with the correct replacement part from ProStock.
(4) Inspect and replace or repair wiring and/or connectors to the motor and/or P.F.C. as necessary.
(5) Replace the blower wheel and/or attach the blower wheel to the motor shaft properly.
(6) Replace the motor.
STATUS: This is a critical fault. The furnace will not operate in any mode of operation.
DESCRIPTION: This is a severe fault that should rarely (if ever) be discovered in the field. It is an indicator of an internal
microprocessor fault on the furnace control (or I.F.C.) or voltage applied to the main gas valve solenoid when there should be
none.
EXPECTED OPERATION: If possible, if the furnace was in heating operation when this fault occurred, the gas valve will
immediately close (flame will be lost), IBM (Indoor Blower Motor) operation will immediately stop and the furnace will shut down
normally (except without IBM operation) with IDM (Induced Draft Motor) post-purge at the correct speed. After the post purge (or
immediately if no heat call was present), no other operation (including thermostat calls) will occur until this fault is cleared.
93 However, this fault may also indicate an internal microprocessor failure. This may mean that the heat call will not end as
expected and that all outputs will be de-energized and gas valve closed immediately when the fault is sensed.
CAUSE:
(1) 24VAC or similar voltage applied to the main gas valve solenoid circuit unexpectedly.
(2) Furnace control software test failure - failed furnace control (or I.F.C.).
SOLUTION:
(1) Check for mis-wiring in the furnace.
(2) Replace the furnace control (or I.F.C.).
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BLOWER FAULT - MOTOR CANNOT RUN
INTERNAL CONTROL FAULT DETECTED