Evo Heat Pump Manual Version 5
Page 77 of 84
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Error Code
Error
Level
Error Message
Action
FGH2
Warning
Temperature differential T4
-
T6 (Temperature of
the thermal transfer fluid returning to the heat
pump from the ground—Temperature of the
thermal transfer fluid leaving the heat pump to
the ground.(2nd compressor))
is greater than set
point. (For twin compressors only)
Check ground pump speed
Check ground flow
Check for flow restrictions on ground side
Check set low flow differentials
LP1
Fault
Low refrigeration pressure in suction gas pipe P3.
Check for flow restriction on ground side
-
usually
accompanied with FGH1 (FGC1 if in cooling). Check
Ground Anti
-
freeze limit, if T5 reading bellow the
setpoint, unit might be frozen
-
allow heat pump to
defrost
-
add correct anti
-
freeze quantity. This fault
could briefly trigger LPS1 fault. Fault may occur on
first run or unit has not run for a long time. Fault
maybe caused by ground pump failure.
LP2
Fault
Low refrigeration pressure in suction gas pipe P4.
(For twin compressors only)
Check for flow restriction on ground side
-
usually
accompanied with FGH2 (FGC2 if in cooling). Check
Ground Anti
-
freeze limit, if T6 reading bellow the
setpoint, unit might be frozen
-
allow heat pump to
defrost
-
add correct anti
-
freeze quantity. This fault
could briefly trigger LPS2 fault. Fault may occur on
first run or unit has not run for a long time. Fault
maybe caused by ground pump failure.
LPS1
Fault
Refrigeration pressure is too low. P3
Fault may occur on units stored in a cold
environment before installation and first run. If
accompanied with LP1 follow action in LP1 section.
Potential loss of refrigerant, refer to Kensa Technical
Support Department.
LPS2
Fault
Refrigeration pressure is too low.
(For twin compressors only) P4
Fault may occur on units stored in a cold
environment before installation and first run. If
accompanied with LP2 follow action in LP2 section.
Potential loss of refrigerant, refer to Kensa Technical
Support Department.
HTPL
Fault
Pressure in distribution side exceeds the high
pressure load side limit. P1
Release pressure to clear error–
check Water
Pressures in commissioning mode. (Load side)
HTPG
Fault
Pressure in ground side exceeds the high pres-
sure ground side limit. P2
Release pressure to clear error–
check Water
Pressures in commissioning mode. (Ground side)
DHT1
Fault or
Warning
Refrigerant temperature T7 in discharge gas pipe
exceeds the allowable high limit (set at the
factory)
Error may occur if compressor is over heating
-
accompanied with HP1. Evaporating temperature
might be too high. Refer to Kensa Technical Support
Department.
DHT2
Fault or
Warning
Gas temperature T8 in discharge gas pipe
exceeds the allowable high limit (set at the
factory)
Error may occur if compressor is over heating
-
accompanied with HP2. Evaporating temperature
might be too high. Refer to Kensa Technical Support
Department.
HGT1
Fault or
Warning
Ground return temperature T5 is higher than
Cooling Mode Upper Limit.
Check Ground Cooling Mode Upper Limit settings.
Ensure adequate flow in ground side. Error maybe
caused by ground pump failure. Compressor 1 will
not run until T5 falls below the upper limit and the
fault has cleared.
HGT2
Fault or
Warning
Ground return temperature T6 is higher than
Cooling Mode Upper Limit. (Twin Compressor
only)
Check Ground Cooling Mode Upper Limit settings.
Ensure adequate flow in ground side. Error maybe
caused by ground pump failure. Compressor 2 will
not run until T6 falls below the upper limit and the
fault has cleared.
FLC1
Warning
Temperature differential T1
-
T2 (load tempera-
ture entering the heat pump—load temperature
leaving the heat pump) is greater than low flow
differential. (Cooling applications only)
Check load pump speed
Check load flow
Check for flow restrictions in distribution system
Check set low flow differentials (Cooling)
FLC2
Warning
Temperature differential T1
-
T3 (load tempera-
ture entering the heat pump—load temperature
leaving the heat pump (2nd compressor)) is
greater than low flow differential. (Cooling appli-
cations and twin compressors only)
Check load pump speed
Check load flow
Check for flow restrictions in distribution system
Check set low flow differentials (Cooling)
