Lochinvar 81-286 No Display, No Burner, Operation, Unit Does, Not Modulate, Above 50%

Models: 81-286

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Service Manual

3 Troubleshooting

Table 3-1Troubleshooting 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 33 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

Weather Shutdown (WWSD) set point for

 

resistance of outdoor air sensor and compare to Table

Operation

main control board.

 

3-2B on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Consult

display for

specific

fault.

Refer

to fault

 

- Unit locked out on fault.

 

descriptions on page 37 of this manual for corrective

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Unit in Shutdown Mode.

• Take unit out of Shutdown Mode.

 

 

 

 

 

 

 

 

 

 

Check ramp delay parameter settings. Optional PC

 

- Ramp delay active.

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ramp delay feature off.

See page 23 of this

 

 

Unit Does

 

 

manual for instructions on how to turn this feature off.

 

 

 

 

 

 

 

 

 

 

 

 

• Check BMS parameter settings. Optional PC

Not Modulate

- Boiler controlled by BMS.

 

software required.

 

 

 

 

 

 

Above 50%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

- Flue sensor open.

Check wiring connections at the flue sensor.

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the resistance of the flue sensor and compare

 

 

 

 

 

to Table 3-2D on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

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Lochinvar 81-286 service manual No Display, No Burner, Operation, Unit Does, Not Modulate, Above 50%

81-286 specifications

Lochinvar 81-286 is a highly efficient and innovative heating solution that represents the latest advancements in boiler technology. This model, part of Lochinvar's prestigious line-up, is designed for commercial applications, delivering superior performance while emphasizing energy efficiency and user-friendly operation.

One of the standout features of the Lochinvar 81-286 is its robust construction. Built with high-quality materials, the unit is engineered for durability and reliability, ensuring long-term operation with minimal maintenance. Its compact design allows for versatility in installation, making it suitable for various building layouts and configurations.

The boiler's primary technology is its advanced condensing capability, which optimizes heat transfer and reduces energy consumption. By efficiently using the heat generated during combustion, the 81-286 can achieve higher thermal efficiencies, often surpassing traditional systems. This results in lower operating costs and reduced greenhouse gas emissions, aligning with the growing demand for sustainable energy solutions in commercial buildings.

Lochinvar incorporates intelligent control systems into the 81-286, featuring user-friendly interfaces that facilitate straightforward programming and monitoring. These control systems enable precise regulation of temperature and pressure, ensuring optimal operation while providing real-time feedback that aids in troubleshooting and maintenance. Users can enjoy the convenience of remote monitoring, enhancing the overall user experience.

Another key characteristic of the Lochinvar 81-286 is its capacity range. The model is available in various sizes, allowing it to meet the specific demands of different facilities, from small businesses to large industrial applications. This flexibility makes it a top choice for contractors and engineers seeking reliable heating solutions that cater to diverse needs.

In addition, the Lochinvar 81-286 boasts exceptional safety features, including built-in safeguards that protect against overheating and pressure surges. These aspects ensure that the unit operates within safe parameters, providing peace of mind for facility managers and operators.

In summary, the Lochinvar 81-286 combines durability, efficiency, and advanced technology, making it an ideal solution for commercial heating needs. With its innovative condensing design, intelligent controls, and safety features, this boiler stands out as a reliable choice for those seeking sustainable and effective heating solutions. Its versatility and performance make it a key player in today’s ever-evolving energy landscape.