75
FAULT FINDING CHART MAIN MENU
Overheat Lockout
Fill System to 1 Bar
Bleed Radiators, Rell System
Check Radiator Valves are Open
Reset Boiler by pressing r
Flow/Return Reversed
Contact Installer
Ignition Lockout
Check other Gas Appliances work
If not, re-instate gas supply
Reset Boiler by pressing r
If fault persists contact installer
Flame Loss
Check other gas appliances work. If
not, re-instate gas supply.
If fault persists, contact installer
No Water Flow Fault
Fill System to 1 Bar
Bleed Radiators, Rell System
If Fault persists contact installer
Thermal Fuse Lockout
Reset Boiler
If fault persists contact installer
PCB Replaced
Reset boiler by pressing r
Pump Rotor Blocked
If fault persists contact installer
No Connection to Primary PCB
Turn power off and on
Contact Installer
Too Many Resets
Contact Installer
Flame on before Gas Valve on
Contact Installer
Flow Thermistor Fault
Contact Installer
Outside Sensor Fault
Contact Installer
Return Thermistor Fault
Contact Installer
Fan Fault
Contact Installer
PCB Replaced Incorrectly
Contact Installer
Low Water Pressure
Fill System to 1 Bar
Bleed Radiators
Rell System to 1 Bar
Low Mains Voltage
Contact Electricity Provider
NO HW BUT CH OK
NO CH BUT CYLINDER
TEMPERATURE OK
BLANK DISPLAY
FLOW TEMPERATURE
SETPOINT CANNOT BE
INCREASED TO 80ºC
PUMP RUNS DURING
THE NIGHT
LOW FLOW TEMPERATURE
FOR CYLINDER OPERATION
Go to Frame 89
No CH but Cylinder
Temperature OK
Go to Frame 88
No CH but Cylinder
Temperature OK
Go to Frame 90
Blank Display
Ensure Flow Temperature
is not limited within Installer
Mode
(see Frame 37)
Ensure System Frost
Protection Temperature
Setpoint is not set too high
(see Frame 40)
If Outside Sensor tted ensure
CH Switched Live and Cylinder
Switched Live connected correctly
to mains input termial strip
Go to Frame 76
Overheat Lockout
Check if Flow
Thermistor correctly
clipped to pipe
Replace Flow
Thermistor
Go to Frame 77
Ignition Lockout
Go to Frame 78
Flame Loss
Go to Frame 86
No Water Flow Fault
Go to Frame 79
Flame Loss
Reset boiler by
pressing r
Unblock Pump
Go to Frame 87
No Connection to
Primary PCB
5 Resets within 15
minutes
Turn power off and on
Go to Frame 80
Flame On before Gas
Valve On
Go to Frame 81
Flow Thermistor Fault
Go to Frame 82
Outside Sensor Fault
Go to Frame 83
Return Thermistor
Fault
Go to Frame 84
Fan Fault
Ensure BCC tted
correctly
Ensure correct BCC
tted
Go to Frame 85
Low Water Pressure
Less than 160V to Boiler
Check Voltage at Boiler Mains In
Check if Local Generator <160V
Contact Electricity Provider