Outdoor Pressure Sensor Miscabling - Toshiba Super MMU-AP0091H Service Manual

Check code name
[F16] / [43]
(d07 / AI-NET)
Are connection of Pd sensor and
Ps sensor connectors correct?
YES
Are output voltage characteristics of
Pd sensor and Ps sensor normal?
YES
Are Pd/Ps output values Pd>Ps
during compressor operation?
YES
Check outdoor I/F P.C. board.
Defect Replace
Check code name

Outdoor pressure sensor miscabling

(Pd, Ps)
NO
NO
* 1 Pressure (Check joint) by pressure gauge
2 Pressure display on 7-segment display
3 Output voltage of I/F P.C. board
If 1 and 2, 3 are different, an error of pressure sensor itself is considered.
If 2 and 3 are different, check interface P.C. board.
NO
* Value can be confirmed by 7-segment display function on outdoor I/F P.C. board.
Pd SW01/02/03=1/1/2
Ps SW01/02/03=1/2/2
1. High-pressure Pd sensor and low-
pressure sensor Ps are exchanged.
2. Output voltage of each sensor is zero.
167
Cause of operation
Correct connection of connectors.
Pd sensor: CN501, Red
Ps sensor: CN500, White
Sensor error Replace
Check compressor.