Open Phase, Negative Phase; Heat Sink Overheat Error - Toshiba Super MMU-AP0091H Service Manual

Check code name
[P05] / [AF]
(d07 / AI-NET)
• Check the phase power line of outdoor unit.
• Check error of outdoor I/F P.C. board.
• Check there is no looseness, etc of terminal.
Check code name
[P07] / [1C]
(d07 / AI-NET)
Sub-code: 01: Compressor 1 side 02: Compressor 2 side
Is power voltage normal?*
YES
Is wiring of IPDU normal?
YES
Is indoor fan normal?
YES
Is screw between IPDU
and heat sink loosened?
NO
Is there no clogging of
heat sink cooling duct?
NO
Check IPDU P.C. board.
Check code name

Open phase, negative phase

Check code name

Heat sink overheat error

NO
* 380–415V ± 10%
NO
NO
YES
YES
191
Cause of operation
1. Power supply open phase
2. Power supply negative phase
Cause of operation
1. Power voltage error
2. Outdoor fan system error
3. Heat sink installation error
4. Clogging of hear sink cooling duct
5. IPDU P.C. board error (TH sensor error)
Correct wiring such as
cable to compressor or
connector connection.
Check fan and fan motor.
Correct power line.
Tighten screws.
Correct clogging.