Boiler Manual

11c Troubleshooting — control module

Make sure ground wiring is installed per wiring diagram. Good grounding is extremely important for proper operation.

Solder or water splatter between plugs and circuit board can cause improper operation of control module. Place a shield over the boiler internal controls and components during installation. Failure to comply could result in severe personal injury, death or substantial property damage.

Control indicator lights — lockout modes

See Charts 1 through 7 in this section for detailed troubleshooting procedures.

To reset control after a lockout, turn off power at the 120 VAC service switch or turn down all thermostats.

Wait 45 seconds. Then restore power or call for heat.

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POWER light flashing alone

Usually indicates reversed polarity of 120 VAC power wires.

POWER and TSTAT CIRC lights flashing

Usually indicates stray voltage on external thermostat circuit wires (usually due to miswired 3-wire zone valve).

POWER and PRESS SWITCH lights flashing

Usually indicates pressure switch is closed when it should not be, or pressure switch failed to close within 5 minutes of inducer starting.

POWER and FLAME lights flashing

Usually indicates false flame sense or flame sensed when it shouldn’t be there.

Part number 550-110-260/0200

Control indicator lights — non-lockout modes

FLAME light flashing alone

Usually indicates pilot flame was not established within 15 seconds from application of spark. Control will flash light, but will continue to cycle indefinitely until flame is established or problem is corrected.

PRESS SWITCH light flashing alone

Usually indicates pressure switch opened during the run cycle.

Troubleshooting the control module

See Figure 25 for location of harness plug receptacles and plugs on the control module.

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Weil-McLain 550-110-260/02002 manual 11c Troubleshooting control module, Control indicator lights lockout modes

550-110-260/02002 specifications

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