Lochinvar 150 - 800 service manual Flow Switch, Flame, Sequence, GV/Relay, Fail

Page 25

Service Manual

3Troubleshooting (continued)

Table 3E Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

Either the manual reset low gas pressure

• Reset the pressure switches.

 

 

 

 

 

 

 

switch or the manual reset high gas pressure

 

 

 

 

Gas Pressure SW

switch tripped.

• Measure the supply gas pressure to determine cause

 

of failure. Natural gas pressures should be between

(will require a manual

 

4 - 14 inches w.c.

 

 

reset once the condition

 

• Refer to Section 7 - Gas Connections of the Armor

has been corrected.

 

 

Water Heater Installation and Operation Manual for

Press the RESET button

 

 

detailed information concerning the gas supply.

on the SMART SYSTEM

 

 

 

 

 

 

display to reset.)

 

• Correct the supply gas pressure if necessary.

 

 

• Check for a loose or misplaced jumper if pressure

 

 

switches are not installed.

 

 

 

 

 

 

 

 

 

The flow switch is not making.

• Check water heater pump operation on a call for heat.

 

 

Flow Switch

 

• Check for closed valves or obstructions in the water

 

heater piping.

 

 

(will require a manual

 

• Verify system is full of water and all air has been

reset once condition has

 

 

purged from the system.

 

 

been corrected. Press

 

 

 

 

 

 

 

 

the RESET button on

 

• Check for loose or misplaced jumpers if flow switch is

the SMART SYSTEM

 

 

not installed.

 

 

display to reset.)

 

 

 

 

 

 

 

 

Blown fuse.

• Replace fuse F2 on the control board, see page 21 of

 

 

 

this manual.

 

 

 

 

 

Blocked Drain SW

The blocked drain switch has detected

• Check condensate tube from unit to floor drain for

excessive condensate build up inside the

proper installation and obstructions.

 

 

(will require a manual

unit.

• Inspect condensate trap for blockage.

Clean if

reset once condition has

 

 

necessary.

 

 

been corrected. Press

 

 

 

 

 

 

 

 

the RESET button on

 

• Check for loose wiring connection at wire

harness

the SMART SYSTEM

 

 

plug.

 

 

display to reset.)

 

 

 

 

 

 

 

 

 

 

• Bad blocked drain switch. Replace switch.

 

 

Flame

The flame detector circuit is seeing a flame

• Check supply voltage for proper polarity.

 

 

Sequence

signal while no flame is present.

 

 

 

 

 

• Check external wiring for voltage feedback.

 

 

(will require a manual

 

 

 

 

 

 

 

 

reset once the condition

 

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

has been corrected.

 

• Check the internal wiring for bad connections.

Press the RESET button

 

on the SMART SYSTEM

 

• Replace main control board.

 

 

display to reset.)

 

 

 

 

 

 

 

 

GV/Relay

The main control board did not detect the gas

• Check wiring harness connection at the gas valve and

Fail

valve.

at the main control board.

 

 

 

 

 

 

 

 

 

 

(will require a manual

 

• Replace the gas valve wire harness.

 

 

reset once the condition

 

 

 

 

 

 

 

 

has been corrected.

 

• Replace the gas valve.

 

 

Press the RESET button

 

• Replace the main control board.

 

 

on the SMART SYSTEM

 

 

 

display to reset.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

 

 

 

 

Image 25
Contents Models 150 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid Service What is in this manual?Maintenance TroubleshootingArmor water heater display ServiceControl inputs Control outputs How the water heater operates General OperationSequence of operation Saving parametersSequence of operation Use this procedure to access menus from the display panel Display panel menu accessButton Operation Display Comments Display panel parameter accessWHR Parameter tableNot used Data logging Viewable and changeable control parametersFunctions WHR settingsNot used Control modes Circulation pumps Service NotificationService technician Maintenance Maintenance and annual startupOwner maintenance 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 sensorsNo Pump NoisyRelief Valve OpeningFlame Flow SwitchSequence GV/RelayNo Flame Ign Running No FlameHigh Limit Manual ResetFan Low Fan Speed LowFan Speed High Fan HighSensor Open Sensor ShortedParameters Rem Ctrl FltProgr Watch Dog Error Service BlkNo Error Stored Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureModels 150 Gas valve adjustment procedureModel Models 600 4Gas Valve Adjustment Model