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Call for heat, boiler starts and back-up contactor is noisy. Try the following:
1. Check for 24VAC out of transformer to contactor. If less than 24VAC, change transformer. If
24VAC, contactor is defective or contacts are dirty. Continue.
2. Turn OFF boiler circuit breakers. Disconnect wires to contactor, remove contactor from boiler,
remove two screws from bottom metal plate on contactor, carefully remove coil and magnetic
core, carefully clean surface of magnetic contacts with emery cloth. Reassemble and reinstall
contactor. Remove all debris, metal shavings, etc. from inside of boiler cabinet. Restart boiler.
If contactor noise continues, replace contactor.
Call for heat, boiler starts but pump doesn't run. Try the following:
1. Check for 120VAC from main electrical panel to pump. Pump must get power from the panel.
2. Route 120VAC from panel to pump through boiler. Run line leg of 120VAC through PP
terminal on boiler. When boiler starts, relay connected to PP will close and start pump.
3. If pump is powered from panel and run through PP as described above and pump does not
start when boiler starts, check for continuity on contact side of PP relay. If not closed, replace
PP relay.
Call for heat, boiler starts, call for heat ends (no lights on board) and boiler continues to heat.
Try the following:
1. Confi rm that the call for heat has ended, disconnect wires to C/W1.
2. Check for amp draw at each element circuit. If there is amp draw, check for 240V AC on
contact side of element relay. If there is 0 voltage, relay has failed closed, change relay.
3. Check for amp draw and if some amp draw but less than full rated amp draw: Set meter to
ohms and check element drawing amps. If element reads less than rated ohms, change
element. If element reads proper ohms, change relay.
Call for heat and boiler tank is "noisy". Hissing, percolating or knocking noise from tank:
1. Most common cause of boiler tank noise is improper fl ow. Refer to installation manual for
proper GPM based on kW size of boiler.
2. If proper GPM fl ow rate through boiler, noise can be caused by sediment build-up on elements.
Check for build-up on outside surface of elements.
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