Lochinvar 402 - 2072 No Display, No Burner, Operation, Unit Does Not, Modulate to 100%

Page 32

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

3 Troubleshooting

Table 3A Troubleshooting Chart - No Display

FAULT

CAUSE

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

Check external line switch, fuse, or breaker.

 

 

 

 

• Check position of ON/OFF switch. Turn switch to the

 

- No 120 VAC supplied to unit.

 

ON position.

 

 

 

 

 

 

 

 

 

 

 

• Check 120 VAC

through

the

ON/OFF switch.

No

 

 

 

voltage through switch, replace switch.

 

 

 

 

 

No Display

 

• Check wiring harness connection between the display

- Bad wiring connection.

 

board and the main control board. Connect the harness

 

 

 

at both points.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Blown fuse.

Replace

fuse

F6

on

the

main

control board,

see

 

 

FIG. 3-1 on page 31 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

Replace board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

Replace main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature set point

Review temperature setting.

 

 

 

 

 

 

satisfied.

 

 

 

 

 

 

 

 

 

 

 

 

 

- Remote thermostat satisfied.

Review remote thermostat setting.

 

 

 

 

No Burner

 

 

 

 

 

 

 

 

 

 

 

 

 

- Outside air temperature above Warm

Check

location

of

outside

air

sensor.

Check

Operation

 

Weather Shutdown (WWSD) set point for

 

resistance of outdoor air sensor and compare to Table

 

main control board.

 

3D on page 33 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

Consult

display for

specific

fault.

Refer

to

fault

 

 

descriptions on pages 35 - 42 of this manual for

 

 

 

 

 

 

corrective actions.

 

 

 

 

 

 

 

 

 

 

 

 

- Ramp delay active.

• Check ramp delay parameter settings. Optional PC

 

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unit Does Not

 

Turn ramp delay

feature

off.

See

page 18

of

this

 

 

manual for instructions on how to turn this feature off.

Modulate to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100%

- Boiler controlled by BMS.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Check

BMS

parameter

settings.

Optional

PC

 

- Outlet temperature too high.

 

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Delta T too high.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32

Image 32
Contents Copper-fin II/IIE Boiler, Water Heater Pool Heater Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials What is in this manual? ServiceMaintenance TroubleshootingService Copper-fin displayControl inputs Control outputs General Operation How the appliance operatesHow the control module operates Sequence of operationSequence of operation OUT 123.8F129HTR Postpurge Display panel menu access Display panel parameter access Datalogging Functions Settingsdhw Resetoutdoor Parameter tableAnti-cycle Delay Yes Temperature settings boiler only Viewable and changeable control parametersData logging FunctionsDHW settings Outdoor air reset boiler only Anti-cycling Control modes Building Management System BMS CascadeService Notification Circulation pumpsMaintenance Maintenance and annual startup Service technicianOwner maintenance See the User’s Information Manual for instructionsMaintenance Check relief valve Inspect/replace hot surface igniter Inspect/replace hot surface ignitersCheck all wiring Check control settingsInspect and clean burner Perform start-up and checksAccess to the burner will require the following steps Checking combustion air pressureAdjusting combustion air pressure Checking manifold gas pressureValve Fitting Control Knob Oiled bearing circulators Inspect and clean the heat exchangerReview with owner Troubleshooting Before troubleshootingCheck control module fuses Check the followingNo Display No BurnerOperation Unit Does NotTemperature Resistance Checking temperature sensorsResistance Temperature Noisy No PumpBoiler Pump System Pump DHW PumpAnti-cycling Flow SwitchFlame Sequence Error No Flame IgnHSI Current Low Flame CKTAuto Reset No FlameRunning High LimitManual Reset Inlet LowSensor Open Sensor ShortedLouver Proving Tank OpenAPS Open APS ClosedTemp O/Shoot Rem Ctrl FltService Blk ParametersProgr Low VoltageWatch Dog Error No Error StoredWrite EEProm Program EEProm
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502 - 2072, 402 - 2072 specifications

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