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8
TROUBLE SHOOTING
PROBLEM
1. Fan contactor is not energised
VI.
THE FANS DON'T
2. The fan thermal cut-outs trip (+)
START
3. The connections are faulty
4. The fan motor is faulty
VII.
1. There's a leak in the refrigerant circuit
LACK OF
REFRIGERANT
LIQUID
VIII.
1. There's not enough refrigerant liquid in the circuit
THE FLUID PIPE
IS HOT
IX.
1. The fl uid fi lter is clogged
THE FLUID PIPE IS
COVERED WITH
FROST
X.
1. Lack of refrigerant gas
THE UNIT CON TI -
2. Compressor not performing as expected
NUES TO WORK
3. The heat load is excessive
WITHOUT
4. The thermostat is badly adjusted or broken
STOPPING
5. The liquid fi lter is clogged
XI.
1. There isn't enough refrigerant liquid
THE UNIT WORKS
2. Moisture in the refrigerant circuit
REGULARLY BUT
HAS AN INSUFFI-
CIENT OUT PUT
XII.
1. The thermostatic expansion valve doesn't work properly
THE COMPRESSOR
2. There isn't enough refrigerant liquid
SUCTION LINE IS
3. The fi lter on the liquid line is clogged
COVERED WITH
4. The water circulation pump is faulty *
FROST
XIII.
1. The 4-way inversion valve is not energised**
THE DEFROSTING
2. The defrosting thermostat set-point is incorrect or the
CY CLE IS NEVER
probe is faulty **
ACTUATED
XIV.
1. The compressor is noisy
ABNORMAL NOISE
2. The thermostatic valve is noisy
IN THE SYSTEM
3. There are vibrations in the piping
4. The panels vibrate
(+) The microprocessor indicates when the safety devices
cut in (see attached manual).
* Operation only during cooling cycle.
** Operation only during heating cycle.
TSH/IK 18 ÷ 31
POSSIBLE REASONS
RECOMMENDED AC TION
1. Check the voltage at the ends of the contactor coil and the continuity
of the coil. Replace if faulty.
2. Inspect the insulation between the windings and between the windings
and the earth.
3. Check and tighten.
4. Check and replace if necessary.
1. After pressurising the circuit at about 10 bar, check with a leak tester.
Repair, depressurise and fi ll with refrigerant liquid.
1. See previous point (VII).
1. Replace the fi lter cartridge or the fi lter (depending on the model).
1. See point VII.
2. Inspect and replace or overhaul.
3. Reduce the heat load.
4. Check the thermostat set-point and replace the thermostat if necessary.
5. Replace.
1. See point VII.
2. Empty the cooling circuit, dry it, replace the fi lter - do the charge again
1. Check, clean and replace if necessary.
2. See point VII.
3. Clean or replace.
4. Inspect the pump and replace it if necessary.
1. Check valve coils. Replace the inversion valve if necessary.
2. Change the set-point or replace the probe if necessary.
1. Check and replace if necessary.
2. Check and add refrigerant liquid.
3. Fix the pipes with brackets.
4. Install correctly.
29
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