Mitsubishi Electric MR. SLIM PKA Series Service Manual page 19

9-3. SELF-DIAGNOSIS ACTION TABLE
Check code Abnormal point and detection method
Room temperature thermistor (TH1)
1
2
Pipe temperature thermistor/liquid (TH2)
1
2
Note:
Contact failure of drain float switch
(CN4F)
3 4
Drain over flow protection operation
1
2
3
OCH637
1
2
3
4
:
:
1
2
3
4
:
:
5
:
1
2
1
2
3
4
Cause
1–3
2
4
1–3
2
4
:
:
5
1
2
1
2
3
4
Countermeasure
: "
: "
: "
: "
: "
3–4
1–4.