Morco GB24 - Fault Codes and Troubleshooting; Fault Finding Chart Main Menu

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SECTION 8 - FAULT CODES
8 FAULT CODES
8.1 FAULT FINDING CHART MAIN MENU
‘L1’
GO TO SECTION 8.2 -
FLOW TEMPERATURE OVERHEAT LOCKOUT
‘L2’
‘L6’
‘F1’
‘F2 or Fn or Ln’
‘F3’
‘F4 or L4’
‘F5 or L5’
‘F6’
‘F7’
‘FA’
‘F8 or L8’
‘F9 or L9’
GO TO SECTION 8.3 -
IGNITION LOCKOUT
GO TO SECTION 8.4 -
FALSE FLAME LOCKOUT
GO TO SECTION 8.5 -
LOW WATER PRESSURE
GO TO SECTION 8.6 -
FLAME LOSS
GO TO SECTION 8.7 -
FAN FAULT
GO TO SECTION 8.8 -
FLOW THERMISTOR FAULT
GO TO SECTION 8.9
RETURN THERMISTOR FAULT
GO TO SECTION 8.10
OUTSIDE SENSOR FAULT
LOW MAINS VOLTAGE -
CONTACT ELECTRICITY PROVIDER
NEGATIVE DIFFERENTIAL
FLOW OR RETURN THERMISTOR FAULT
PCB UNCONFIGURED/FAULTY OR GAS VALVE
SHORT CIRCUIT.
IF FAULT PERSISTS REPLACE PCB
IF FAULT PERSISTS REPLACE PCB
NO CH BUT DHW OK
NO DHW BUT CH OK
NO DISPLAY
GO TO SECTION 8.11
GO TO SECTION 8.12
GO TO SECTION 8.13
‘LC’
5 RESETS WITHIN 15 MINS -
TURN POWER OFF AND ON
RESTART PROCEDURE: to restart boiler press the restart button.
‘FU’
DIFF GREATER THAN 50°C
CHECK ISOLATION VALVES ARE OPEN
CHECK PUMP
CHECK RAD VALVES OPEN
CHECK SYSTEM BLOCKAGES