Pioneer WD Series, Service Manual

Page: 9 / 40

8
II. Troubleshooting
1. According to the fault code
(1) Display E1 or E2:
Symptom
Display E1 or E2
Cause
Room temperature sensor (IRT) and Indoor
pipe (coil) temperature sensor (IPT) fault
S/N Inspections How to Solve Remarks
1 Contact between indoor
temperature sensor CN6 (RT, IPT)
and slot
Insert again if loose. Photo 1
2 Measure the resistance on the two
ends of indoor temperature sensor:
(25 / 5K
Ω ). For other resistance,
℃
please refer to the Temperature –
Resistance Sheet (Appendix 1).
Replace the temperature sensor
if the resistance is incurred to
drift, open or short circuiting. Photo 2
3 If the above testing is normal Replace the indoor control board
Position and marking of temperature sensors
CN6 (RT, IPT) on indoor control board
1033 Unit and 1240 Unit
indicate the dimensions of indoor unit.
Measure the resistance of
indo or temperature sensor