58
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
Installation and Servicing
SECTION 4 - FAULT FINDING
Spare PCB Not Set
Switch Off
Wait 5s
Switch On
Restart Menu
PCB Fault
Contact Installer
Restart Menu
Low Mains Voltage
Contact Electricity
Provider
Menu
High Mains Voltage
Contact Electricity
Provider
Menu
Flow/Return Reversed
Contact Installer
Menu
Room Stat Fault
Check Room Stat
Batteries
Menu
No CH operation but
DHW operates OK
No DHW operation
but CH operates OK
No Display
Follow instructions
in Section 3.19
Replace PCB
Low Mains Voltage
Contact
Electricity Provider
Contact
Electricity
Provider
Check
Return Thermistor
Check
Room Stat
Batteries
Go to Section 4.11
Go to Section 4.12
Go to Section 4.13