Look at the comment #117. The wire diagram. Look at the S1 master switch, pin 26. Wire P66D16 runs from S1-26 to TB 5-9. During start up, you should have at S1-26, 24 VDC. At TB5-9, you should have 24 VDC. From TB5-9, the wire goes through J2 and J3 and comes to the K5. It should have 24 VDC...