48
Symptom 6: Space heating capacity shortage at low outdoor temperatures
POSSIBLE CAUSES
CORRECTIVE ACTION
Backup heater operation
is not activated.
•
Check if that the "OTHER HEATING SOURCE/ IBH FUNCTION" is
enabled.
•
Check whether or not the thermal protector of the backup heater has been
activated.
•
Check if booster heater is running, the backup heater and booster heater
can’t operate simultaneously.