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Symptom
Cooling
x
x
x
E The compressor
does not start
x
because the
minimum
pressure switch
has tripped
x
x
x
x
x
F The fans do not
start
x
x
x
x
G Lack of gas
H Frost in the
liquid line
x
downstream from
a filter
x
x
I The unit works
continuously
x
without ever
stopping
x
x
x
L The unit works
regularly but with
an insufficient
x
capacity
Who can take
corrective action U
Heating
= User
S = specialised
personnel
x
s
x
s
x
u
u
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
u
x
s
x
s
x
s
x
s
x
s
Probable cause
Pressure switch out of order
Machine completely void of
refrigerant
Finned coil clogged, airflow rate is
too low
Water circulation pump blocked
Water circulation pump blocked and
defective
Presence of frost on the evaporator
coil
Evaporator fan not working
Refrigerant filter clogged
Expansion device that is not working
properly
Presence of moisture in the
refrigerant circuit
Fan contactor de-energized
Lack of output voltage from the
control fan speed
Thermal protection inside the fan
Fan motor faulty
Loose electrical connections
Loss in the refrigerant circuit
The filter is clogged
Lack of refrigerant gas
Incorrect tuning of the operating
thermostat
Excessive thermal load
Compressor does not give the
thermal output
The liquid filter is clogged
Low refrigerant charge
4-way reversing valve defective
Page 34
Possible remedy
Check and replace.
See point G.
Remove dirt from the coil.
Unlock the pump
Check the pump and replace if necessary
See point N.
See point F.
Check and replace.
Check and replace if necessary.
Replace the filter, dry and recharge
Check the voltage across the coil of the
contactor and the continuity of the coil.
Check the contacts, replace if necessary.
Check the condition of the fan and the air
temperature during operation of the unit.
Check and replace.
Check and replace.
Check the cooling circuit using a leak
detector after pressurising the circuit to
approximately 4 bars.
Repair, evacuate and refill.
Replace the filter
See item G.
Check and set.
Reduce the thermal load
Check, change or revise
Replace.
See point G.
Check the power supply and the coil of the
valve and replace the valve
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