Toshiba MMU-AP0091H 161, P26 Tr short-circuit protection error, P29 Compressor position, P31

Check code Check code name Cause of operation

[P26] / [14]	G-Tr short-circuit protection error 1.	Outdoor unit power error
(TCC-L / AI-NET)	2.	IPDU error/Cable connection error
	3.	Compressor error
	4.	IPDU P.C. board error

Check code Check code name Cause of operation

[P29] / [16]	Compressor position	1.	Wire connection error.
(TCC-L / AI-NET)	detective circuit error	2.	Compressor error
		3.	IPDU P.C. board error

Sub-code:01: Compressor 1 side 02: Compressor 2 side

Sub-code:01: Compressor 1 side 02: Compressor 2 side

Is the power supply voltage		NO
to the outdoor unit normal?
	YES
		NO
Is wire connector connection
on the IPDU P.C. board normal?
	YES
		NO
Is compressor operation normal?
	YES
		NO
Is smoothing condenser normal?
(1500µF, 350V)

Correct power line.

Correct the wire connections.

Replace compressor.

Check capacity valve external appearance.

Are the connectors and wiring		NO
to the compressor normal?
	YES
		YES
Is it grounded?
	NO
		YES
Is there a winding short?
(Is winding resistance 0.1 to 0.3W?)
	NO

YES

Is the winding open circuit?

NO

Check and correct circuit and

wires, i.e. to the compressor, etc.

Compressor error ÆReplace

Compressor error ÆReplace

Compressor error ÆReplace

161

YES

Replace IPDU P.C. board.

Check IPDU P.C. board.

Failure ÆReplace

Check code	Check code name	Cause of operation
[P31] / [47]	Other indoor error	Other indoor unit in the group has a error.
(TCC-L / AI-NET)	(Group follower unit error)

When the header unit of the group detects [E03, L03, L07, L08 error], the follower unit(s) in the group display [P31] error and stop. There are no check code displays or alarm record on the main remote controller.