FieldBench
Daikin codes

Daikin

b1

Lockout

Blower motor communication

IFC lost serial comms with the circulator.

Walk b1 in Diagnose

4 plates — walk the one on the cabinet

First check

1 Reseat the serial plug

On Daikin DM80VC this is a communicating / serial ECM, not a tap motor. Kill power, reseat the 14-pin (or OEM serial plug) at the motor and at the IFC. Pins straight, no corrosion. Harness, motor module, IFC serial output.

Expect: Plug fully seated both ends. Correct motor for this cabinet.

The rest of the walkthrough is Diagnose.

On the plates

  • Harness, motor module, IFC serial output.
  • Power-cycle once after the harness is proven. Then motor vs board.
  • Harness, motor, IFC.

Plates that use b1

Same number, other makers

b1 on Daikin is not the same code on these plates.