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RTC 6i - www.regulus.eu
Refrigerant evaporation pressure too low
If an error of a too low refrigerant evaporation pressure occurs 3 times in a row, the unit will shut
down.
Check:
•
whether there is sufficient refrigerant in the unit
•
that no refrigerant circuit leaks are present
•
technical condition of the fan and circulation pump
•
whether the expansion valve is working properly
•
whether the heating water temperature isn’t too low
•
whether the flow and return temperature difference isn’t too big
Refrigerant condensation pressure too high
If an error of a too high refrigerant condensation pressure occurs 3 times in a row, the unit will shut
down.
Check:
•
whether there isn’t too much refrigerant in the unit
•
whether the water flow is sufficient
•
technical condition of the fan and circulation pump
•
whether the expansion valve is working properly
•
whether the heating water temperature isn’t too high
•
whether the flow and return temperature difference isn’t too large
•
whether the heat exchangers heat transfer surfaces are not clogged
Communication error
Check:
•
cables
•
settings of switches on the PCB (the last 3 should be set to 001)
Compressor phase error (current or overload)
Check:
•
compressor power cable
•
compressor inverter board for error
•
the inverter board and its connections
Undervoltage / overvoltage of the VDC module
Input voltage is too high or low.
EEPROM error
Turn off the power and use a jumper to connect the JP404 terminals on the outdoor unit PCB. Turn
on the power. Turn off the power and remove the jumper on the JP404 terminals. If the error persists,
replace the PCB.
The outgoing water temperature is too low
If the outgoing water temperature in cooling mode is lower than 5 °C, the compressor will switch off.
Check:
•
temperature sensor
•
water temperature
•
water flow rate
