ARENA 30 A
37
Domestic hot water sensor
faulty
• Sensor damaged or
wiring cut
• Check wiring or replace the
sensor
Flue gas sensor faulty
• Sensor damaged or
wiring cut
• Check wiring or replace the
sensor
External probe faulty
• Sensor damaged or
wiring short-circuited
• Check wiring or replace the
sensor
No communication between
main board and ignition devices
• Wiring cut or incorrect
between main board and
ignition devices
• Check the wiring and the
connections between the
boards
Fault
Possible cause
Solution
Microprocessor faulty
• Microprocessor operation
faulty
• Disconnect and restore the
electrical power supply. If the
problem persists check and/or
replace the main board
High flue gas temperature
• Flue partially blocked
or insufficient
• Check the efficiency of the flue,
the flue gas exhaust pipes and
the outlet terminal
Excessive central heating
outlet temperature
• Pump blocked
• Pump faulty
• Free the pump by removing the
cap and rotating the shaft with a
screwdriver
• Check or replace the condenser
or the pump
Excessive central heating
return temperature
• No system circulation
• Domestic hot water heat
exchanger dirty or
blocked
• Check system and pump
• Clean domestic hot water heat
exchanger
Outlet sensor faulty
• Sensor damaged or
wiring cut
• Check wiring or replace the
sensor
Return sensor faulty
• Sensor damaged or
wiring cut
• Check wiring or replace the
sensor
Summary of Contents for ARENA 30 A
Page 32: ...ARENA 30 A 32 fig 23g fig 23f fig 23h N O ...
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