False flame detected after shutdown.
- Unexpected flame signal detected more than 10 seconds after closing the gas valve.
- If persistent locking errors, A19 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.
