TM

Installation & Service Manual

13 Troubleshooting

Table 13E Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

Flame

 

• Check supply voltage for proper polarity.

 

 

Sequence

 

• Check external wiring for voltage feedback.

(will require a manual

The flame detector circuit is seeing a flame

• Check the flame rod and make sure it is clean.

reset once the condition

signal while no flame is present.

 

has been corrected.

 

• Check the internal wiring for bad connections.

Press the RESET button

 

• Replace main control board.

on the display to reset.)

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

damage and connection. Reference page 56 of this

 

 

manual for removal and cleaning procedures.

 

 

Replace if necessary.

 

 

• Check for proper electrical grounding of the unit.

 

 

• Check incoming supply gas pressure. Natural gas

 

 

pressures should be between 4 - 14 inches w.c. and

 

 

LP gas pressures should be between 8 - 14

 

 

inches w.c. Refer to Section 7 - Gas Connections for

 

 

detailed information concerning the gas supply.

 

 

• Verify that the plastic hose from the gas valve to the

 

 

air inlet is connected and is not damaged.

 

 

• Verify that the vent/air intake pipes are correctly

 

 

installed and that there are no obstructions.

 

 

• Check for 24 VAC to the gas valve at the 2-pin

 

 

connection on the side of the main control board

No Flame Ign

 

during the ignition attempt. If no voltage is present,

 

replace the main control board.

(will require a manual

 

• If 24 VAC is present at the main control board, check

reset once the condition

The unit has failed to prove main burner

has been corrected.

ignition after four (4) attempts.

the wiring between the main control board and the

gas valve. Replace the wiring if necessary. Do not

Press the RESET button

 

 

disconnect the wiring from the gas valve and attempt

on the display to reset.)

 

 

to measure voltage at that point. The main control

 

 

 

 

board can detect if the gas valve is not connected and

 

 

will display the GV / Relay Fail fault.

 

 

• If 24 VAC is present, check the outlet of the valve to

 

 

ensure the valve is flowing gas. With a manometer

 

 

connected to the outlet tap of the gas valve, when the

 

 

unit is in the prepurge period, there should be a

 

 

negative pressure present. When the valve is

 

 

energized a change in pressure should occur. If the

 

 

pressure change does not occur, the gas valve is not

 

 

opening. Replace the gas valve.

 

 

• Inspect flame sensor and associated wiring.

 

 

Reference page 56 of this manual for removal and

 

 

cleaning procedures. Replace if necessary.

 

 

• Inspect the burner. Reference page 56 of this manual

 

 

for removal and cleaning procedures. Replace if

 

 

necessary.

 

 

• Replace the main control board.

 

 

 

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Lochinvar SNA285-125, SNA500-125, SNR200-100, SNR150-100, SNA400-125 service manual Sequence, No Flame Ign
Page 61 Page 63

SNA400-125, SNR150-100, SNA285-125, SNR200-100, SNA500-125 specifications

Lochinvar has established itself as a leader in the realm of high-efficiency heating solutions, and its line of condensing boilers, including the SNA500-125, SNR200-100, SNA400-125, SNA285-125, and SNR150-100, exemplifies the brand’s commitment to innovation, efficiency, and reliability.

The SNA500-125 model stands out with its impressive heating capacity, designed for larger commercial applications. Featuring advanced modulating burners, it can precisely adjust its output based on real-time demand, significantly enhancing energy efficiency. The stainless steel heat exchanger ensures robust durability and improved thermal performance, while the integrated controls offer advanced diagnostic capabilities and user-friendly operation.

Next in the lineup, the SNR200-100 serves as a versatile option for mid-sized applications. Its compact design allows for flexible installation, making it a valuable choice for facilities with limited space. The boiler incorporates a high-efficiency combustion system that maximizes fuel utilization, while its low NOx emissions technology aligns with environmental standards, reducing the carbon footprint of users.

The SNA400-125 delivers a robust solution for diverse heating needs, equipped with state-of-the-art modulation technology that not only optimizes efficiency but also offers quiet operation – a crucial feature for facilities where noise reduction is paramount. This model also includes built-in redundancy options, enhancing reliability during peak operational periods.

The SNA285-125 provides a balance of performance and efficiency for smaller commercial settings. Its innovative control system offers precise temperature management and easy integration with existing systems. Energy Star certified, this model is not only cost-effective but supports sustainability efforts in various industries.

Lastly, the SNR150-100 is ideally suited for light commercial applications, featuring a compact footprint and excellent heat transfer capabilities. The user-friendly interface and robust safety features make it an excellent choice for operators prioritizing both ease of use and reliability.

All these models incorporate Lochinvar's commitment to superior design and advanced technologies, setting a benchmark in the high-efficiency heating market. With a focus on long-term performance and compliance with modern environmental standards, Lochinvar continues to deliver top-tier solutions tailored to meet diverse customer needs. Whether for large-scale operations or smaller settings, these boilers represent a significant advancement in commercial heating technology.
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