Cause of error code A14

Internal error 

- Internal error with the control software.

Solution for error code A14

- If persistent locking errors, A14 occur, systematically disconnect all wires not supplied by the factory with the exception of the power supply (CH T’Stat, DHW T’Stat, LWCO, Pumps, etc.). If the error code goes away, determine which circuit may be introducing electrical noise or feedback. 
- If the error persists after all these wires are disconnected, contact your PB Heat representative. 
- If this error occurs after replacing a control, contact your PB Heat representative.