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maintenance guide
52
Overheat
Insu cient
circulation
Water pressure
Bleed heat exchanger
Pump operation
CH return lter for blockages
Circulation around boiler (blockages)
ntc temperature sensors
Insu cient water
(request lling)
Water pressure gauge for correct pressure
Check for waterleaks on the entire system
CH Flow temp.
probe circuit open/
short circuit
Check connections and wiring to temp
sensors
CH Flow temp.
probe circuit open/
short circuit
Resistance values of temp sensors
Heating delivery
probe problem
Details in maintenance guide in installation
manual
Floor thermostat
contact open
Check terminals TA2 for presence of link
wire
EEPROM Error Check the EEPROM connection onto the
pcb
Communication
error
Check connection and wiring onto all
devices, main and display pcb
Main PCB error
Too many (>5)
resets in 5 minutes
Identify reason for lockout from table and
check for relevant faults
No Flame detected Insu cient working gas pressure
1st Ignition failed Spark electrode/wiring connectors
2nd Ignition failed Ignition electrode/wiring connectors
Flame cut-o Spark generator/wiring connectors
Check ue system for correct assembly/
termination
Check earth
Gas valve
CO2 settings
Soft light rate
Flame detected
with gas valve
closed
Ignition electrode/wiring connectors
Ignition electrode wiring connection onto
main pcb
Flame lift Insu cient working gas pressure
Check ue system for correct assembly/
termination
CO2 settings
Thermofuse open Check wiring and connections to
thermofuse
Check integriry of main heat exchanger
Fan speed error Check fan
Check wiring connections from fan to pcb
Fault nding