Lochinvar 402 - 2072 Noisy, No Pump, Boiler Pump System Pump, DHW Pump, Relief Valve, Opening

FAULT

CAUSE

CORRECTIVE ACTION

- Gas supply problem.

• Refer

to the

Gas

Connections

Section

of the

Installation and Operation Manual for detailed

information concerning the gas supply.

- Gas/air mixture problem.

• Refer to the Checking Manifold Gas Pressure and

Combustion Analysis Procedure on pages 27 and 28 of

this

manual

for

the proper

settings.

Verify

that the vent/air intake lengths do not exceed the

maximum listed in the Venting section of the

Installation and Operation Manual.

- Dirty/damaged burner.

• Refer to pages 26 and 27 in this manual for the burner

Noisy

removal and inspection procedure. Clean or replace the

Operation

burner as necessary.

- Air in the piping system.

• Properly purge all air from the piping system.

- Low system water pressure.

• Verify system pressure is a minimum of 12 PSI.

- Faulty pump relay.

• Replace relay.

No Pump

- Faulty pump.

• Replace pump.

Operation -

Boiler Pump

System Pump

- Internal fault on control board.

•

Check fuse F5.

or

•

Replace main control board.

DHW Pump

Note: Make sure the boiler pump horse power (hp) does

not exceed 1 hp.

- System pressure exceeds relief

valve • Lower the system pressure below the rating of

setting.

the supplied relief valve or replace the standard relief

valve with a higher rated valve up to the maximum

pressure of the heat exchanger.

Relief Valve

- Improperly sized expansion tank.

• Install properly sized expansion tank.

Opening