22
ECONCEPT 100
Resistance at terminals 7-8 of
connector X5 not connected
Check value and connection of
resistance
Resistance at terminals 11-12
of connector X7 not connected
Check value and connection of
resistance
External sensor fault
Sensor damaged or wiring
short circuit
Check wiring or change sensor
No communication between
main board and ignition
equipment
Disconnected or incorrect
wiring between main board
and ignition equipment
Check wiring and connections
between boards
Fault
Possible cause
Cure
Microprocessor fault
Microprocessor operation
fault
Disconnect and reinstate power
supply. If the trouble persists, check
and/or replace main board
System delivery
overtemperature
Circulating pump blocked
Circulating pump fault
Free the circulating pump by
removing the cap and turning the
shaft with a screwdriver
Check or replace the condenser
or circulating pump
System return overtemperature
No system circulation
Domestic circuit heat
exchanger dirty or blocked
Check system and circulating pump
Clean domestic circuit heat
exchanger
Delivery sensor fault
Sensor damaged or wiring
disconnected
Check wiring or change sensor
Return sensor fault
Sensor damaged or wiring
disconnected
Check wiring or change sensor
