When the water temperature is below 3 °C (BACTPDFR_ON), an incident is signalled, and deleted when
the condition disappears.
If a short circuit or an open circuit is detected in one of the coil probes, and provided that there is no other
stage:
1. An incident is signalled
2. The stage is inhibited
3. There is a change to the antifreeze function to protect the circuit from water
Dirty filters
Their activation causes a signal to be produced for an incident in the dirty filters.
DPC-1 thermostat
Errors in the thermostat with relays (no communication)
If the Y signal is activated without the G signal, or if the Y1 or Y2 signals are activated without the G
signal, it acts as if the G signal were active.
An incident is signalled in the Y1 or Y2 signal without the G signal.
Protections
Protections for defrosting
If 3 defrosts (DFRNOMAX) are produced successively and finish after the time of 10 minutes
(DFRTIMAX) and incident is signalled for repeated defrosting.
N O T E
The incident is deleted when the defrost is finalised by completing a different condition to that of the
maximum time.
Protections due to temperature
• If the outdoor temperature is lower than ‑10 °C (CMPTPEXT_OFF) the compressor stops and an
incident is signalled for excessively low outdoor temperature (only in heat mode).
– The incident disappears when the outdoor temperature is higher than ‑8 °C (CMPTPEXT_ON).
• If the discharge temperature is higher than 130 °C (DISTPAVR) the compressor and the outdoor fan
are stopped. An exceeded discharge temperature fault is signalled.
• If the discharge temperature does not rise above 35 °C (DISTPREC_HEAT) in heat mode, or 50 °C
(DISTPREC_COOL) in cool mode, an incident is signalled for temperature not recovered.
– The compressor must be running for 10 minutes (DISTIREC) or 5 minutes (DISTIREC_DFR) if
the previously switched operation is defrost.
• If the suction probe temperature is lower than ‑4 °C (CMPTPASP_LO_3) and the compressor has
been in operation for 10 minutes (CMPTIASP_LO), the compressor and the outdoor fan are stopped.
It is also possible to reach this condition if the suction probe temperature is lower than ‑25 °C
(CMPTPASP_LO_1).
– When the time has passed (CMPTION), the compressor starts again. If this condition is repeated
3 times (CMPNOTP_ASP_LO) in 60 minutes (CMPTIASP_LO_NO) a fault is signalled for repeated
cold start-ups, and the compressor is prohibited from starting up.
• If there is a water coil and the water temperature does not exceed 30 °C (BACTPH2O_MIN) after 5
minutes (BACTIH2O_MIN) the valve closes and the coil is inhibited until the subsequent start-up.
Further attempts are made every 20 minutes (BACTIRTR) and an incident is signalled for water coil
temperature not recovered.
• If the supply temperature is higher than 55 °C (TEMP_MAX_IMP) an incident is indicated for high
supply temperature and the heat stages are stopped until the problem is resolved every 5 minutes
until the temperature drops below 55 °C.
• If the supply temperature is higher than 80 °C (TEMP_IMP_AVR) the unit is stopped and a fault is
signalled for 'Smoke or high temperature detection'.
• If there is demand for heat generation using gas and there is no fault, the supply temperature is lower
than 25 °C (TEMP_MIN_IMP) and an incident is signalled for low supply temperature with demand
for gas.
5
Malfunctions
5.2 Causes
20
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