3 Troubleshooting
Service Manual
44
Table 3F Troubleshooting Chart - Noisy System
FAULT CAUSE CORRECTIVE ACTION
Noisy
Operation
- Supply gas problem. Natural gas
pressures should be between 4 inches w.c.
(1.0 kPa) and 14 inches w.c. and LP gas
pressures should be between 8 inches w.c.
(1.99 kPa) and 14 inches w.c. (3.5 kPa).
• Refer to Section 6 - Gas Connections of the Crest
Installation and Operation Manual for detailed
information concerning the gas supply.
- Gas/air mixture problem.
• Refer to the Gas Valve Adjustment Procedure in this
manual for the proper gas valve setting. Verify that the
vent/air intake lengths do not exceed the maximum listed
in the General Venting section of the Crest Installation
and Operation Manual.
- Dirty/damaged burner.
• Refer to this manual for the burner removal and
inspection procedure. Clean or replace the burner as
necessary.
- Air in the piping system.
• Properly purge all air from the piping system.
- Dirt or debris caught in the air intake that may
be blocking inlet air.
• Check or replace the filter.
No Pump
Operation -
Boiler Pump
System Pump
or
DHW Pump
- Blown fuse.
• Replace fuse F4 on the control board.
- Faulty pump.
• Replace pump.
- Internal fault on control board.
• Replace main control board.
- Faulty pump relay.
• Replace relay.
- Incorrect parameter setting.
• Reference the Boiler Pump Mode and System
Pump Mode parameters in the Service section of this
manual.
No Blower
Operation
- Internal fault on control board. • Replace control board.
- Faulty blower. • Replace blower.
- Faulty blower relay. • Replace relay.
Relief Valve
Opening
- System pressure exceeds relief valve
setting.
• Lower the system pressure below the rating of
the supplied relief valve or replace the standard relief
valve with a higher rated valve up to the maximum
pressure of the heat exchanger 160 psi (40 kPa).
• Improperly sized expansion tank.
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