57
Is field wiring loose or faulty?
Is power supply between 59
and 61 Hz?
NO
YES
_ P _ _ _
Blocking Error E 4 5
Net frequency error
Correct wiring
Is power supply circuit breaker
loose or faulty?
Provide frequency
stabilized power
supply rated at 60 Hz
+/- 2%
Replace Control
Module
YES
YES
NO
NO
Replace circuit
breaker
13 - TROUBLE SHOOTING
Fix the connection.
These error messages are displayed
when the control board detects fault in
blower motor system.
Check wire connector to blower.
Check connector J9 on control board.
Is any connection loose?
YES
NO
Replace blower motor. Does
this correct the problem?
YES
NO
Boiler is operating
properly
Replace Control Module
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