Service Manual

3 Troubleshooting (continued)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3A Troubleshooting Chart - No Display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAULT

CAUSE

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

- No 120 vac supplied to unit.

Check external line switch, fuse, or breaker.

 

 

 

 

Check position of ON/OFF switch. Turn switch to the

 

 

 

 

ON position.

 

 

 

 

 

 

 

 

 

• Check 120 vac through the ON/OFF switch.

 

 

 

 

• Check wiring

harness connection

between

display

 

 

 

 

board

and

main

control

board. Connect

No Display

 

 

 

harness at both points.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- No voltage through the switch.

Replace switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

Replace board.

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

Replace the main control board.

 

 

 

 

 

 

 

 

 

 

- Blown fuse.

• Replace

fuse

F2 on

the main control board, see

 

 

 

 

page 38 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature set point

Review temperature setting.

 

 

 

 

 

satisfied.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Remote thermostat satisfied.

Review remote thermostat setting.

 

 

 

No Burner

 

 

 

 

 

 

 

 

 

 

 

 

- Outside air temperature above Warm

Check

location of

outside

air

sensor.

Check

Operation

Weather Shutdown (WWSD) set point for

 

resistance of outdoor air sensor and compare to Table

 

 

 

main control board.

 

3C on page 38 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

Consult

display for

specific

fault.

Refer

to fault

 

 

 

 

descriptions on page 40 of this manual for corrective

 

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

- Ramp delay active.

Check ramp delay parameter settings. Optional PC

 

 

 

 

software required.

 

 

 

 

 

Unit Does Not

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ramp delay feature off.

See page 20 of this

Modulate

 

 

Up to 100%

 

 

 

manual for instructions on how to turn this feature off.

 

- Boiler controlled by BMS.

Check BMS parameter settings.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

37

Page 37
Image 37
Lochinvar 1.5, 3.5, 2.5 service manual Troubleshooting

3, 2, 3.5, 2.5, 1.5 specifications

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