PB - The indoor fan motor has a fault.
Mitsubishi Electric lists PB as fan motor error in the PEA installation manual. The same manual notes that each unit has two fan motors in this family, so the fault may relate to either motor or its associated circuit.
Applies to the PEA-M100-160HAA installation-manual family; the manual specifically notes paired fan-motor components in this range.
Severity
High
Display
Shown as check code PB on the remote controller. In the self-check table, eleven beeps/flashes map to PB.
Support first?
Often not
Models in range
PEA-M100HAA, PEA-M125HAA, PEA-M140HAA
What to do first
Start with these checks
- 1Turn the system off and do not keep retrying it if airflow has stopped.
- 2If safely accessible, check whether return or supply openings are obstructed.
- 3Arrange service if PB remains after restart.
Likely causes
What usually sits behind this code
Indoor fan motor fault
Fan motor wiring or connector issue
Indoor control-board drive fault affecting the fan motor
Contact support
Contact customer support if any of these apply
- !PB appears and the indoor fan does not run normally
- !Airflow is weak or absent
- !The code comes back immediately after power cycling
- - The official table labels PB as 'Fan motor error'.
- - The PEA manual states these units have two fan motors and instructs technicians to check both relevant items when PB appears.
Related codes
Nearby codes in this family
More ranges
More Mitsubishi Electric air-conditioner ranges
Source notes
Source and scope
Source: Mitsubishi Electric Australia installation manual
The PEA-M100-160HAA installation manual lists PB as 'Fan motor error' and notes that affected models have two fan motors to check.
Last reviewed: 2026-04-19
The official source identifies the fan-motor subsystem, but service inspection is still needed to confirm which motor or drive component has failed.