Lochinvar 402 - 2072 Service Blk, Low Voltage, Watch Dog Error, Write EEProm, Program EEProm

Page 43

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

3 Troubleshooting (continued)

Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface

FAULT

 

DESCRIPTION

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Establish a heating load to remove heat from

the

 

 

 

 

 

 

 

 

system.

 

 

 

 

 

 

 

 

 

• Verify that the system is full of water and that all air

 

 

 

 

 

 

 

 

has been properly purged from the system.

 

 

 

 

 

 

 

 

 

• Verify that the appliance is piped properly

into

the

 

 

 

 

 

 

 

 

system. Refer to the Water Connections Section of

Service Blk

While the unit is in Service Mode, the outlet

 

the Installation and Operation Manual for the proper

temperature has exceeded 185°F (85°C).

 

 

piping methods.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Check 120 VAC to the pump motor on a

call

for

 

 

 

 

 

 

 

 

heat. If voltage is not present, check the wiring

 

 

 

 

 

 

 

 

leading to the main control board. Replace the main

 

 

 

 

 

 

 

 

control board if necessary.

 

 

 

 

 

 

 

 

 

• If 120 VAC is present on a call for heat

and

the

 

 

 

 

 

 

 

 

pump is not operating, replace the pump.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Check 120 VAC supply to the transformer.

 

 

 

 

 

 

 

 

 

• Check wiring connections at the low voltage terminal

Low Voltage

120 VAC input to the main control board has

 

strip.

 

 

dropped below 100 VAC.

 

 

 

 

 

 

 

 

 

 

 

• Check the wire size/length to remote devices.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

Watch Dog Error

The

main control

board

has

detected

an

•

Cycle main power.

 

 

internal fault.

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Write EEProm

The

main control

board

has

detected

an

•

Cycle main power.

 

 

internal fault.

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Program EEProm

The

main control

board

has

detected

an

•

Cycle main power.

 

 

internal fault.

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CRC Parameters

 

 

 

 

 

 

•

Cycle main power.

 

 

The

main control board has detected an

• Replace the main control board.

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Restore default parameters using the PC program.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•

Press RESET.

 

 

No Error Stored

The

main control board has detected an

•

Cycle main power.

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

43

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Page 42 Page 44
Contents Copper-fin II/IIE Boiler and Water Heater Models 402 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid Troubleshooting What is in this manual?Service MaintenanceCopper-fin display ServiceControl inputs Control outputs Sequence of operation General OperationHow the appliance operates How the control module operatesOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Only Parameter table a Boiler OperationAnti-cycle Time Anti Cycl Tm Parameter table B Water Heater Operation BMS Service Notification Pumps Viewable and changeable control parameters Temperature settingsFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Inspect/replace hot surface igniters Check relief valveInspect/replace hot surface igniter Perform start-up and checks Check all wiringCheck control settings Inspect and clean burner2Adjusting air shutter 399,999 750,000 Btu/ hr Models Checking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Review with owner Inspect and clean the heat exchangerOiled bearing circulators Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance DHW Pump NoisyNo Pump Operation Boiler Pump System PumpFlame Sequence Flow SwitchAnti-cycling Flame CKT ErrorNo Flame Ign HSI Current LowHigh Limit Auto ResetNo Flame RunningSensor Shorted Manual ResetInlet Low Sensor OpenAPS Closed Louver ProvingTank Open APS OpenRem Ctrl Flt Temp O/ShootParameters Progr Low Voltage Service BlkWatch Dog Error No Error Stored
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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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