Alarm conditions:

Įrenginys fiksuoja šilumokaičio užšąlimą, kai po keturių bandymų atsitirpinti išlieka užšąlimo sąlygos: One of the clauses are not fulfilled after 3 heat exchanger defrost tries.

1. Heat exchanger efficiency is below critical value,
2. Pressure between heat exchanger is higher than critical value.

Possible causes:

1. Defrosting algorithm does not work,
2. Temperature sensor failure,

Troubleshooting:

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