Johnson ICEBERG Serie Manuel D'instructions page 109

Symptom 6: Space heating capacity shortage at low outdoor temperatures
POSSIBLE CAUSES
Backup heater
operation is not
activated.
CORRECTIVE ACTION
• 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.
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