17
ALARM CODES
E05
E06
E07
E11
E12
E13
E21
E22
Anti-freeze alarm.
It indicates the outlet water temperature is lower
than +3ºC.
After 1 automatic reset, it comes to be a manual
reset.
Outlet water temperature probe alarm (St2).
Outlet water temperature probe open or without
connecting.
Refrigerant piping temperature probe (St3)
alarm.
Refrigerant piping temperature probe open or
without connecting.
Compressor 2 thermal protection alarm:
- Compressor thermal protection open.
- Faulty power supply.
VIS.
RE
MAN
AUTO
AUTO
AUTO
AUTO
MAN
MAN
MAN
High pressure switch alarm, circuit 2.
This alarm may indicate the following problems:
- High pressure switch protection.
- Fuses of the fan burnt out.
Low pressure switch alarm, circuit 2.
This alarm may indicate the following problems:
- Low amount of refrigerant.
- Low water flow in cooling cycle.
- Blocked coil in heating cycle.
- Fuses of the fan burnt out.
After two automatic resets in one hour, it comes
to be a manual reset.
Press the ON/OFF button until the alarm
disappears; if the alarm shows up again, check:
• Coil clean and no blocked.
• Water flow on the heating cycle.
• Check fuses of the fan.
• Outside temperatures very high.
• Check refrigerant charge.
When this alarm shows up repeatedly, and
the alarm keeps on, make an electrical reset
and check:
• Coil clean and no blocked.
• Water flow on the cooling cycle.
• Check fuses of the fan.
• Outside temperatures very low.
• Check refrigerant charge.
These protections are automatic reset; if alarm
shows up again, check:
• Connection of outlet water temperature
probe (St2) (see electrical diagram),
check continuity and change the faulty
component.
Press the ON/OFF button until the alarm
disappears; if alarm shows up again,
• Check the water filter.
• Check water flow.
• Check that the water pump is
connected to power supply of the unit.
High pressure / high temperature alarm.
It is activated when refrigerant piping
temperature probe (St3) detects a temperature
higher than 70ºC and the high pressure switch
has not been activated.
Press the ON/OFF button until the alarm
disappears; if alarm shows up again, check:
• Working of high pressure switch.
• Coil clean and no blocked.
• Water flow on the heating cycle.
• Check fuses of the fan.
• Outside temperatures very high.
• Check refrigerant charge.
• Check low pressure switch working.
• Coil clean and no blocked.
• Check water flow on the cooling cycle.
• Check fuses of the fan.
• Outside temperatures very low.
• Check refrigerant charge.
DESCRIPTION
EFFECT
ACTION
These protections are automatic reset; if alarm
shows up again, check:
• Connection of refrigerant piping
temperature probe (St3) (see electrical
diagram), check continuity and change
the faulty component.
Low pressure / low temperature alarm.
It is activated when refrigerant piping probe
(St3) detects a temperature lower than -30ºC
and the low pressure switch has not been
activated.
Press the ON/OFF button until the alarm
disappears; if alarm shows up again, check
continuity and change the faulty component.
• Check refrigerant charge.
• Check the refrigerant circuit is not
blocked.
• Check connections and fuses.
• Check power supply.
Unit stops
(*)
Unit stops
Unit stops
Circuit 1
compressors
stop
Circuit 1
compressors
stop
Compressor 2
circuit 1
stops
Circuit 2
compressors
stop
Circuit 2
compressors
stop
(*) Unit
stops
except water pump.
