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Troubleshooting – Lochinvar CREST 3 User Manual

Page 39

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3

Troubleshooting

(continued)

Service Manual

39

Table 3F Troubleshooting Chart - Noisy System

FAULT

CAUSE

CORRECTIVE ACTION

Noisy

Operation

- Supply gas problem. Natural and LP gas
pressures should be between 4 inches w.c.
(1.0 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 on

page 53 of 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 page 34 in 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.

No Pump

Operation -

Boiler Pump

System Pump

or

HWG Pump

- Blown fuse.

• Replace fuse F4 on the control board, see page 36 of
this

manual.

- 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.

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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