Lochinvar 402 - 2072 No Display, No Burner, Operation, Unit Does, Not Stage to, 100%

Page 34

Copper-fin II/IIE Boiler and Water Heater Service Manual

3 Troubleshooting

Table 3A Troubleshooting Chart - No Display

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

•

Check external line switch, fuse, or breaker.

 

 

 

 

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

 

- No 120 VAC supplied to unit.

 

ON position.

 

 

 

 

 

• Check 120 VAC through the ON/OFF switch.

No

 

 

 

voltage through switch, replace switch.

 

 

 

 

 

 

No Display

 

• Check wiring harness connection between the display

- Bad wiring connection.

 

board and the main control board. Connect the harness

 

 

 

at both points.

 

 

 

 

 

 

 

 

 

- Blown fuse.

•

Replace fuse F6 on the main control board,

see

 

 

FIG. 3-1 on page 33 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

•

Replace board.

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

•

Replace main control board.

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature setpoint

•

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) setpoint for

 

resistance of outdoor air sensor and compare to Table

 

main control board.

 

3C on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

•

Consult display for specific fault.

Refer

to

fault

 

 

descriptions on pages 37 - 43 of this manual for

 

 

 

 

 

 

corrective actions.

 

 

 

 

 

 

 

 

 

 

Unit Does

- Boiler controlled by BMS.

 

 

 

 

 

 

• Check BMS parameter settings.

Optional PC

 

Not Stage to

- Outlet temperature too high.

 

software required.

 

 

 

100%

 

 

 

 

 

- Delta T too high.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

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Contents Copper-fin II/IIE Boiler and Water Heater Models 402 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid Maintenance What is in this manual?Service TroubleshootingService Copper-fin displayControl inputs Control outputs How the control module operates General OperationHow the appliance operates Sequence of operationSequence of operation OUT 123.8F129HTR Postpurge Display panel menu access Display panel parameter access Parameter table a Boiler Operation OnlyAnti-cycle Time Anti Cycl Tm Parameter table B Water Heater Operation BMS Service Notification Pumps Temperature settings Viewable and changeable control parametersData logging FunctionsDHW settings Outdoor air reset boiler only Anti-cycling Control modes Building Management System BMS CascadeService Notification Circulation pumpsOwner maintenance Maintenance Maintenance and annual startupService technician See the User’s Information Manual for instructionsMaintenance Inspect/replace hot surface igniters Check relief valveInspect/replace hot surface igniter Inspect and clean burner Check all wiringCheck control settings Perform start-up and checks2Adjusting air shutter 399,999 750,000 Btu/ hr Models Adjusting combustion air pressure Checking manifold gas pressureValve Fitting Control Knob Review with owner Inspect and clean the heat exchangerOiled bearing circulators Check control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit DoesResistance Temperature Checking temperature sensorsTemperature Resistance Operation Boiler Pump System Pump NoisyNo Pump DHW PumpFlame Sequence Flow SwitchAnti-cycling HSI Current Low ErrorNo Flame Ign Flame CKTRunning Auto ResetNo Flame High LimitSensor Open Manual ResetInlet Low Sensor ShortedAPS Open Louver ProvingTank Open APS ClosedRem Ctrl Flt Temp O/ShootParameters Progr No Error Stored Service BlkWatch Dog Error Low Voltage
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402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.
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