MTD 400 Manuel de service télécharger pdf (Page 50)

50 AWR MTD - AWR MTD/B GB 01/2009

TROUBLESHOOTING

AI

No voltage

Supply voltage too low

Switch QF1 in OFF position

Remote switch (if featured) in OFF position

Control panel set to OFF

Main switch QS1 in OFF

Compressor thermal overload switch OFF

Check presence of voltage

Check safety systems upstream of

the appliance

Check power line

Switch ON

Contactor coil faulty

HSW11 controller fault

Start-up capacitor faulty (if featured)

Compressor faulty

Reversed phases (three-phase units only)

Replace the component

Check

Replace the component

Check

Check

Check

Protection devices trip

and shut down the com-

pressor

Excessive discharge pressure

Low suction pressure

Low voltage

Electrical connections not sufficiently tight

Operation outside permitted limits

Faulty operation of pressure switches

Check supply voltage

Check electrical insulation of

windings

Thermal protector tripped

Insufficient capacity

Insufficient refrigerant

Sizing of unit

Operation outside recommended limits

Noise and vibrations

Contact between metal bodies

RepairWeak foundations

Tighten screws

Loose screws

Compressor noisy

Liquid returning to compressor

Inadequate fastening

Reverse one phase

Reversed phases (three-phase units only)

The heat pump doesn’t

start

FAULT CAUSE SOLUTION

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