Manuals / Lochinvar / Household Appliance / Plumbing Product

Lochinvar 402 - 2072, 502 - 2072 Manual Reset, Inlet Low, Sensor Open, Sensor Shorted

Models: 502 - 2072 402 - 2072

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

3 Troubleshooting

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

The outlet water temperature has exceeded

• Verify setting of adjustable high limit.

 

 

the setting of the adjustable high limit.

• 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

Manual Reset

 

the

Installation

and

Operation Manual

for

 

proper piping methods for the Copper-fin.

 

High Limit

 

 

 

• Check 120 VAC to the pump motor on a call for heat.

(Will require a manual

 

reset once condition has

 

If voltage is not present, check wiring leading to the

 

main control board. Replace the main control board if

been corrected. Press

 

 

necessary.

 

 

 

the RESET button on

 

 

 

 

 

 

 

 

 

 

the SMART SYSTEM

 

• If 120 VAC is present on a call for heat and the pump

display to reset.)

 

is not operating, replace the pump.

 

 

 

• If the system pump is a variable speed pump, ensure

 

 

the system flow is not less than the boiler flow.

 

 

 

• Check temperature setting of the main control board.

 

 

• Check resistance of water sensors and compare to

 

 

the tables on page 33 of this manual. Replace the

 

 

sensor if necessary.

 

 

 

 

• Replace outlet sensor or high limit.

 

 

 

 

 

 

The inlet water temperature did not exceed

• Raise temperature set point above 130°.

 

 

130° within 15 minutes of ignition.

• Install a 3-way valve or LTV valve per the piping

Inlet Low

 

 

diagram in the Water Connections Section of the

 

 

Installation and Operation Manual.

 

 

 

• Replace the inlet sensor.

 

 

 

 

• Replace the main control board.

 

 

 

 

 

Sensor Open

 

• Check the sensors and

their associated wiring.

 

Repair or replace the sensor or wiring if damaged.

(Will require a manual

 

Either the inlet water, outlet water, system

 

 

 

 

 

reset once the condition

• Measure the resistance of the sensors and compare

has been corrected. Press

supply, system return, or outdoor temperature

the RESET button on the

sensor has been disconnected.

the

resistance to

the tables on page 33 of

this

manual.

 

 

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

 

 

to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

Sensor Shorted

Either the inlet water, outlet water, system

• Check the sensors and their associated wiring.

(Will require a manual

supply, system return, or outdoor temperature

Repair or replace the sensor or wiring if damaged.

reset once the condition

sensor has been shorted.

• Measure the resistance of the sensors and compare

has been corrected. Press

 

the RESET button on the

 

the resistance to the tables on page 33 of this

SMART SYSTEM display

 

manual.

 

 

 

 

 

 

 

 

 

to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

 

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Lochinvar 402 - 2072, 502 - 2072 service manual Manual Reset, Inlet Low, Sensor Open, Sensor Shorted
Page 37 Page 39

502 - 2072, 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.