Pioneer WD Series, Руководство по обслуживанию

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(18) Display P7
Symptom Display P7
Cause Overheating protection under heating mode
S/N Inspections How to Solve Remarks
1
Check if the air inlet and outlet of
outdoor unit is blocked by any
obstructions. Install to the position as required in
the Instruction Manual and ensure
the air inlet and outlet of the
outdoor unit is smooth.
2
Check the system for shortage of
refrigerant.
Add refrigerant
3
Check if the exhaust temperature
sensor is drifted, short circuited or open
circuited. (Measure the resistance of
the resistors on two ends of indoor
temperature sensor: (25 / 5K
Ω ). For
℃
other resistances, please refer to the
Temperature – Resistance Sheet
(Appendix 1).
Replace the Room temperature
sensor(IRT) and Indoor pipe(coil)
temperature sensor(IPT)
Photo 27
4 Control board damaged Replace the indoor control board
(19) Display P8
Symptom Display P8
Cause Outdoor overtemperature / undertemperature
protection
S/N Inspections How to Solve Remarks
1
The compressor cannot run under
cooling mode when the outdoor
temperature is lower than -1 , or run
℃
under heating mode when the outdoor
temperature is higher than 33 , whilst
℃
the compressor alarms P8 protection.
Normal protection function
2
If the temperature is not within the
protective range above, please refer to
the Temperature – Resistance Sheet
(See Appendix). Use the multimeter to
measure the resistors on the two ends
of outdoor intake temperature sensor
(CN1) (25 /5K
Ω ). For other ℃
resistance, please refer to the
Temperature – Resistance Sheet.
Replace the sensor if it is incurred
to drift, open circuiting or short
circuiting.
Photo 28
3 If the fault remains unsolved after
replacement of the sensor Replace the outdoor power source
board
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