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Note
The alarm codes listed above are the most common. If a alarm code not listed above is displayed, con-
tact technical assistance.
If any of P3/P4/P2/P1 continuously appear 3 times within single heating cycle, system will consider it as
Heat Pump system error”.
Contact a qualified person to service the unit.
Code Description Solution
P1
System high pressure protection:
Unit 300S : >=3.0Mpa active; <=2.4MPa inactive.
Unit 190S : P1 error code never appear because
pressure switch
Maybe because of system blocked, air or water or more
refrigerant in system (after repair), water temperature sensor
malfunction, ect.
Contact a qualified person to service the unit.
P2
High discharge temperature protection
Unit 190S/300S : >115 °C Protection
active; <90 °C Protection inactive
Maybe because of system blocked, air or water or less
refrigerant(leakage) in system( after repair), water temperature
sensor malfunction, ect.
Contact a qualified person to service the unit.
P3
Compressor abnormally stopped protection
The discharge temperature is not so higher than
evaporator temperature after compressor running a
term.
Maybe because of compressor broken or bad connection
between PCB and compressor.
P4
Compressor overloaded protection (10 sec after
compressor startup, Current checking starts ,
1) only compressor running, if it is >10A , the
compressor will be stopped and protected.)
2) Compressor + e-heater opened, if it is >IEH+10,the
compressor will be stopped and protected.)
Possible absorption or abnormal activation of the
electrical resistance.
Maybe because of compressor broken, system blocked, air or
water or more refrigerant in system(after repair), water
temperature sensor malfunction, ect.
Check that the resistance does not absorb current when the
display is turned off. This circumstance is interpreted by the unit
as a compressor anomalous absorption.
Contact a qualified person to service the unit.
LA
When the ambient temp T4 is out of Heat Pump running
range (-7 ~ 43 °C ) Heat Pump will stop, unit will show
LA on the position of clock on display until T4 back to (-7
~ 43 °C).
Only valid for the unit without e-heater.
Unit with e-heater will never show "LA".
It is normal, and no necessary to repair.
Alarms
10 CONTROL
57


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