70
COSMOGAS
Ecotwin
9 - DIAGNOSTICS
Code
Description
Status
Solution
P06
The compressor reduces its speed
due to the high pressure detection
Compressor
stopped
If the pressure is too high, this protection is activated. The system resets
itself after 5 minutes. If the same error occurs 3 times consecutively in a
certain amount of time, the system is permanently blocked. Check that the
fan or pump motors are running smoothly. Check that the compressor is
working properly. Check that the water temperature is not too high and that
the difference between supply and return is less than 8 ° C.
P07
Compressor preheating
Standard
operation
This is normal protection and needs no action. When the compressor is
inactive for a long time and the outdoor temperature is low, the compressor
heater is activated before the compressor is started to bring it to the correct
temperature.
P08
Compressor discharge temperature
too high
Compressor
stopped
Check that the water supply temperature is not too high, especially if the
outdoor temperature is low; check that the water flow rate of the system is
sufficient. Check that there is sufficient refrigerant in the system.
P09
Evapo-condensing battery
temperature protection
Compressor
stopped
Check that air circulates freely in the outdoor unit.
P10
Voltage beyond the limits
Compressor
stopped
The electrical supply voltage is too low or too high. Check the supply voltage
P11
Compressor off due to too high or too
low outdoor temperature
Compressor
stopped
The outdoor temperature is too high or too low to guarantee operation.
P12
Compressor limit speed reached due to
too high or too low speed
Compressor
speed slow
down
This is normal protection which does not need any action.
P14
Compressor stopped due to too low
pressure detected by the high pressure
sensor
Compressor
stopped
If the system pressure is too low this protection is activated. The system
automatically resets after 5 minutes. If the same error occurs 3 times
consecutively in a certain period of time, the system is permanently blocked.
Check that the system has the right amount of refrigerant or internal leaks
(probably the amount of refrigerant is not enough and this results in too low
a pressure). Check that the fan and pump motor work correctly; Check that
the evapo-condensing battery or the plate heat exchanger are not blocked;
Check that the electronic expansion valve works properly; Check that the
water temperature is not too low.
S01
Frost protection in cooling
Compressor
speed reduced
or off
The compressor speed is reduced if the liquid line temperature sensor (TUP)
falls below 2 ° C. It stops if it drops below -1 ° C. The compressor restarts
when the temperature exceeds 6 ° C. 1. Check that the temperature set for
cooling is not too low, that the water flow rate is not insufficient and check
the filter; Check the pressure read by the low pressure sensor.
S02
Water flow rate too low
Compressor
stopped
The system water flow is too low. Check the hydraulic system, especially
the filter. Check the proper functioning of the pump.
S03
Water flow switch error
Compressor
stopped
Check that the water flow switch is not badly connected or broken. Check
that there is no external pump that is pushing water inside the machine.
S04
Communication error
Unit stopped
Too much data lost in communication. Check that the BUS communication
cable between the indoor and outdoor units is less than 30 meters long. Check
that there are no sources of disturbance nearby. The message disappears
when communication is restored.
S05
Connection error on the serial port
Unit stopped
Communication between control panel and control board or gas side board
failed. Check the electrical wiring. Check that the microswitches on the
control and gas side boards are positioned as shown in the wiring diagram.
The system restarts as soon as communication is restored.
S06
Water temperature too low in cooling
mode
Compressor
stopped
The compressor stops if the supply water has a temperature below 5 ° C
in cooling. Check that the “Tc” sensor is connected well and that it works
correctly. Check that the set temperature is not too low and that the water
flow rate is sufficient.
S07
Water temperature too high in heating
mode
Compressor
stopped
The compressor stops if the supply water has a temperature above 57 ° C
in heating or DHW production. Check that the “Tc” sensor is connected well
and that it works correctly. Check that the set temperature is not too high
and that the water flow is sufficient.
