Errors

Boiler type Greenstar KWB42-3

Error code d3

Cause:

Temperature high limit defective.
External guard has tripped.
Temperature limiter locked out.

Solution:

- Check temperature sensor and leads for interruptions or shorts, and replace if defective.
- Temperature guard TB1 has tripped. Check if jumper across 8-9 or PR-P0 is missing.
- Reset external temperature limiter (if installed).Reset LWCO (if installed).