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 F3 on the main control board, see

 

 

 

 

 

page 38 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature set point

Review temperature setting.

 

 

 

 

satisfied.

 

 

 

 

 

 

 

 

 

No Burner

 

 

 

 

 

 

 

- Remote thermostat satisfied.

Review remote thermostat setting.

 

 

 

Operation

 

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

Consult display for specific fault.

Refer

to fault

 

 

 

 

 

descriptions on page 42 of this manual for corrective

 

 

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Water heater controlled by BMS.

Check BMS parameter settings.

 

 

 

 

 

 

 

 

 

Unit Does

- Flue sensor open.

Verify that the flue sensor is located in the flue outlet.

Not Modulate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Above 50%

 

 

Check wiring connections at the flue sensor.

 

 

 

 

 

 

 

 

 

 

 

Check the resistance of the flue sensor and compare

 

 

 

 

 

to Table 3C on page 40 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

39

Page 39
Image 39
Lochinvar 1.3, 1.5 service manual Troubleshooting

1.5, 1.3, 1 specifications

Lochinvar 1 is a remarkable achievement in the realm of modern technology and engineering. As a powerful and efficient water heater, it has been designed to cater to a wide range of residential and commercial needs. One of the standout features of Lochinvar 1 is its advanced heating technology, which incorporates a high-efficiency condensing design. This technology allows the unit to achieve impressive energy savings by maximizing heat transfer while minimizing energy consumption.

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