Lochinvar Water Heater Troubleshooting: Flame Fail Ignition, Anti-Cycling & More
Page 29

Service Manual

3Troubleshooting (continued)

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after a

 

Anti-cycling

for heat too quickly after the previous call for

set time period.

 

heat has ended.

 

 

 

 

 

 

• The control board will release the call for heat if the

 

 

 

 

 

 

outlet temperature drops too quickly.

 

 

 

 

 

 

The unit has failed to prove main burner

• Inspect spark electrode and associated wiring for

 

 

ignition after four (4) attempts.

damage and connection. Reference page 22 of this

 

 

 

manual for removal and cleaning procedures.

 

 

Exception: Models 501 - 801 will lock out

Replace if necessary.

 

 

after one retry for ignition. It will require a

• Check for proper electrical grounding of the unit.

 

 

manual reset before attempting to fire again.

 

 

 

• 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 of the Armor

 

 

 

Water Heater Installation and Operation Manual 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

 

Flame Fail Ign

 

connection on the side of the main control board during

 

 

the ignition attempt. If no voltage is present, replace

 

(will require a manual

 

the main control board.

 

reset once the condition

 

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

 

has been corrected.

 

 

 

the wiring between the main control board and the gas

 

Press the RESET button

 

 

 

valve. Replace the wiring if necessary. Do not

 

on the SMART SYSTEM

 

 

 

disconnect the wiring from the gas valve and attempt to

 

display to reset.)

 

 

 

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 22 of this manual for removal and

 

 

 

cleaning procedures. Replace if necessary.

 

 

 

• Inspect the burner. Reference page 22 of this manual

 

 

 

for removal and cleaning procedures. Replace if

 

 

 

necessary.

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

29

 

 

 

 

 

 

 

 

 

 

 

 

Page 28 Page 30
Image 29
Page 28 Page 30
Contents Models 151 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials Service What is in this manual?Maintenance TroubleshootingArmor water heater display ServiceControl inputs Smart System Control BoardControl outputs Smart System Control BoardGeneral Operation Access modesHow the water heater operates Sequence of operationOperation Display Button Screen Operation Display Status Display panel menu accessDisplay panel parameter access General Parameter tableModes Viewable and changeable control parameters Data Logging DHW SettingsFunctions Anti-CyclingControl modes Circulation pumps Minimum On/Off TimeService Notification Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check water heater relief valveCheck all water heater wiring Check ignition ground wiringCheck control settings Perform start-up and checksCleaning heat exchanger Check flame signalReview with owner Oiled bearing circulatorsBefore troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature F Resistance Ω Checking temperature sensorsWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNo Pump NoisyRelief Valve OpeningFlow Switch Fault Description Corrective ActionFlame Fail Ign Anti-cyclingRunning No FlameManual Reset Auto ResetFlame Sequence High LimitFan Speed Low Fan LowGV/Relay FailLouver Proving Sensor ShortedFlue Temp High Delta T HighRem Ctrl Flt Service BlkOutlet Temp High No Error Stored Watch Dog ErrorFatal Error Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureModel Gas valve adjustment procedureModels 151 Models 601 4Gas Valve Adjustment Model

151 - 801 specifications

Lochinvar 151 - 801 is a high-efficiency commercial water heater designed to meet the demanding needs of various applications in the hospitality, healthcare, and educational sectors. This advanced system provides reliable hot water with enhanced performance while promoting energy conservation and sustainability.

One of the standout features of the Lochinvar 151 - 801 is its powerful heating capability. With a robust heating input of up to 150,000 BTU per hour, it ensures a steady supply of hot water even during peak demand times. The efficient heat exchanger design optimizes thermal performance, allowing for quicker recovery rates, which is essential for facilities requiring substantial hot water usage.

This model integrates cutting-edge technologies to maximize energy efficiency. Utilized in the Lochinvar 151 - 801 is the Smart System control technology, which provides precise temperature management and diagnostics. This feature not only enhances operation efficiency but simplifies service and maintenance by providing real-time data and alerts, leading to reduced downtime.

Additionally, the Lochinvar 151 - 801 employs a stainless-steel tank construction that promotes durability and robustness. The tank is adequately insulated to minimize heat loss, thus keeping energy costs down. Its compact design also allows for easy installation in various spaces, including those with limited footprints.

Moreover, the unit features advanced combustion technology, including a modulating gas valve that adjusts the flame size according to demand, promoting even greater efficiency. This ensures that the water heater operates at optimum performance levels, reducing fuel consumption while ensuring a consistent supply of hot water.

Safety is a primary concern for Lochinvar, and the 151 - 801 model includes several integrated safety features, such as an ignition safety shutoff and a temperature/pressure relief valve. These systems work together to provide peace of mind while ensuring the unit operates safely within its designated parameters.

In conclusion, the Lochinvar 151 - 801 is an exemplary choice for commercial applications, offering powerful performance, efficient technologies, durable construction, and enhanced safety features. With its combination of high output and advanced monitoring capabilities, it stands as a reliable solution for organizations seeking an effective hot water heating solution.
Top Page Image Contents