Service Manual

3 Troubleshooting

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 43 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.

 

3D on page 45 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

Consult display for specific fault.

Refer

to

fault

 

 

 

descriptions on page 47 of this manual for corrective

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

- Ramp delay active.

Check ramp delay parameter settings. Optional PC

 

 

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ramp delay feature off.

See

page 19 of

this

 

 

 

manual for instructions on how to turn this feature off.

Unit Does

 

 

 

 

 

 

- Boiler controlled by BMS.

• Check

BMS

parameter settings.

Optional

PC

Not Modulate

 

software required.

 

 

 

 

 

Above 50%

 

 

 

 

 

 

 

 

 

 

- Flue sensor open.

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

 

 

 

 

 

 

 

 

 

Check wiring connections at the flue sensor.

 

 

 

 

 

 

 

 

Check the resistance of the flue sensor and compare

 

 

 

to Table 3C on page 45 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

44

Page 44
Image 44
Lochinvar 1 service manual No Display, No Burner, Operation, Unit Does, Not Modulate, Above 50%

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.

The Lochinvar 1 utilizes a stainless steel heat exchanger that enhances durability and corrosion resistance. This not only extends the lifespan of the unit but also ensures consistent performance over time. Coupled with a user-friendly control system, users can easily adjust settings and monitor performance, enhancing overall convenience and usability.

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Moreover, the unit supports various venting options, offering flexibility during installation. Whether using traditional vertical venting or innovations like direct venting, Lochinvar 1 accommodates different building designs and local codes, making it highly versatile.

In conclusion, Lochinvar 1 epitomizes the melding of efficiency, reliability, and user-friendly technology. With its high-performance features, robust safety systems, and adaptable installation options, it stands out as a forefront player in the water heating industry, meeting the diverse needs of today's consumers and businesses alike.