Rheem 97MDV060 Series Installation Instructions Manual Download

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2. OVERSPEED OPERATION (CODE “66”)

Note: This code will only be displayed during the first
three minutes of blower operation and then only if
the call for fan is great enough to force the motor into
speed limit.

A. Is the duct work of the system restrictive or con-

fined? Or, maybe many (or all) of the supply regis-
ters are closed in the duct system. If so, the motor
may indicate that it is operating in power limit
under certain conditions by displaying code “66”.
Remove the restrictions or reconfigure the duct
work to avoid this code.

B. Is the motor set-screw not tightened to the motor

shaft? This may cause erratic motor operation
and cause the furnace to display a “66” fault code.
Further, airflow will be low or air may not be mov-
ing at all.

3. INTERNAL ERROR – MOTOR UNABLE TO OPER-

ATE (FAULT CODE “61”)

If the blower motor is able to communicate with the
furnace control but is experiencing an internal issue
– such as overheating, the fault code “61” will be dis-
played. Internal overloading may reset once the con-
dition causing the problem has been removed.
However, it is likely that the motor will need to be re-
placed.

A. Is the motor wheel blocked by an obstruction? If

so, the motor may be in locked-rotor state and the
furnace control will report fault code “61”. Remove
the obstruction and try to operate the motor again.
If the motor continues to fail, it may be perma-
nently damaged and may need to be replaced.

B. Is the motor overheating? If so, it may report an

overheat condition to the furnace control and the
control will report fault code “61”. Determine the
cause of overheating and repair. Try to operate
the motor again. If the motor continues to fail, it
may be permanently damaged and may need to
be replaced.

4. INTERNAL ERROR – MOTOR ABLE TO

OPERATE (FAULT CODE “60”)

This is a low-level fault that is not likely to be dis-
played often. Operation will continue as normal but
fault code will be displayed. Long-term permanent
damage to the motor is not expected.

DIAGNOSTICS AND TROUBLESHOOTING

DIAGNOSING BLOWER MOTOR ISSUES

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FIGURE 64

LOW VOLTAGE CONNECTION PIN DETAIL

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