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The software has failed to detect a need to pump water within 90 seconds of the start of the cycle.

1. The boiler does not heat up. No power to the boiler. Field Service Tech. repair

2. Check thermal fuse, using an ohmmeter check for continuity between J1-3 & lower terminal on the boiler. If you read less than 1Ω thermal fuse is good. If the thermal fuse checks good proceed to step 3, if bad replace and check the unit for proper operation. Test pump using pump tester. Field Service Tech. repair

3. Check resistance reading between J1-3 & J1-4 should read approx. 11Ω. Field Service Tech. repair

4. Check for line voltage at terminals J1-3 & J1-4 during warm-up. If the reading is good, proceed to step 5; if bad, PCB (Printed Circuit Board) is defective. Shop repair

5. Check for line voltage at boiler terminals. Field Service Tech. repair