Sanyo XH4242 / CH4242, XH3642 / CH3642, XH2442 / CH2442, UH3642 / CH3642, TH4242 / CH4242 0343MI

4. Service procedures

11)Symptoms: LCD on the remote controller displays “CHECK P03”. (Alarm for unusual discharge temp. of compressor)

Start

Unusual discharge gas temperature

•Refrigerant shortage

•Clogged refrigerant circuit

•Electronic refrigerant control valve defect (indoor unit)

0343_M_I

12)Symptom: LCD on the remote controller displays “CHECK P04”. (High-pressure switch activation warning)

Start

The system does not operate again.

Yes

High-pressure switch activation

(Both cooling and heating)

•Electronic refrigerant control valve defect

•Refrigerant over-charged (Cooling)

•Outdoor unit, heat exchanger dirty, clogged

•Outdoor unit air short

•Outdoor fan stopped

(Heating)

•Outdoor unit air short

•Indoor unit, heat exchanger dirty, clogged

•Large pipe side service valve closed

•Indoor fan stop

•Air filter clogged

No

Are there connection defects in the wiring?

No

High-pressure switch defect

Yes

Repair the wiring.

4

0344_M_I

SM830082

IV - 15