The control system has detected open contacts at the Blower Prover air pressure switch after Blower has been energized.
Ensure the Blower Prover air pressure switch sensing tube is connected properly at both ends and that it is not kinked or damaged. Repair/replace anything worn or damaged as necessary.
Check all wiring between CCB’s J6 Socket (page 35) pins 6 & 7 and the Blower Prover air pressure switch. Repair/replace anything worn or damaged as necessary.
Perform close visual inspection of the pins inside the CCB J6 plug and socket – ensure plugs and sockets are mating properly and providing good contact.
Review the air pressure switch information beginning on page 18. Perform the pressure switch test procedure for the Blower Prover air pressure switch – see pages 21 through 23. Replace the Blower Prover switch if defective.
