Models 3.2 - 13.2, controller µchiller
Blue Box - Page 66
SYMPTOM
OPERATION
PROBABLE CAUSE
POSSIBLE CORRECTIVE ACTION
COOLING
HEATING
G)
No compressor
running. (display On,
with alarm "E3" or
⊗ ⊗
Resistance RK3 or RK4
faulty or disconnected (only
version LC and LC/HP)
Check resistance and replace if
necessary
"E5")
⊗ ⊗
Connections to pressure
sensor interrupted (HP
version only or if
condensation pressure
control with fan speed
regulator is fitted with
version LC and LC/HP)
Restore correct connections to
pressure sensor ("E3" refers to
compressor 1, "E5" refers to
compressor 2)
⊗ ⊗
Faulty pressure sensor (only
on HP version or if
condensation pressure
control with fan speed
regulator is fitted with
version LC and LC/HP)
Replace pressure sensor ("E3"
refers to compressor 1, "E5"
refers to compressor 2)
H)
Unit runs with
insufficient capacity
(Display On without
⊗ ⊗
Insufficient refrigerant
charge
Check refrigerant circuits with
leak detector, repair leak and
recharge circuit
alarms)
⊗ ⊗
Presence of moisture in
refrigerant circuit
Replace refrigerant filter and, if
necessary, dehydrate and
recharge circuit
⊗ ⊗
One compressor fails to
start, power circuit open
and compressor contactor
energised
Find and eliminate the cause of
the protection intervention;
change the fuses.
If the fuses blow immediately,
replace the compressor.
⊗ ⊗
A compressor fails to start,
fuses are OK and
compressor contactor is de-
energised
Check voltage across compressor
contactor coil and continuity of
coil; if necessary, replace coil
⊗
4-way reversing valve
locked or coil faulty
Check power supply and coils of
valves and replace valves if
necessary
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