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Part number 550-110-260/0200
43
Boiler Manual
Troubleshooting — control module11c
26036
Make sure ground wiring is installed
per wiring diagram. Good
grounding is extremely important
for proper operation.
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.
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.
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.
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.