ESIE09-08B External Backup Heater Kit
Appendix 253
7.6 Troubleshooting by Indication on the Remote Controller
Remote control
display
AA
Subcode 0
Applicable
models
All indoor models
Method of
malfunction
detection
Malfunction detection is carried out by safety contacts in the heater kit
Malfunction
decision
conditions
Supposed causes
Heater kit thermal protector (Q2L, activation temperature: 92°C) or thermal fuse (F1T,
activation temperature: 122°C) error
Heater kit connected to benefit kWh rate power supply and wrongly configured
No heater kit installed
Troubleshooting
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
External
backup heater
connected?
Set [6-02] to 0
Is the
benefit kWh mode in
use?
NO
YES
YES
Properly configure the wiring
NO
Has the
thermal protector Q1L
operated?
YES
- Check if the circuit is filled with
water and there is no air inside
- Check if waterflow is possible
- Check the flowswitch, relays and
contactors
- Reset Q1L by pressing
NO
Has the 5A
T 250V fuse F1U
melted?
YES
- Check the electrical components
- Replace the fuse
NO
Has the
thermal fuse F1T
melted?
YES
Replace the entire external backup
heater
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