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APPENDIX A - CONTROL MODULE
P/N# 240008852, Rev. M [07/2015]
Operational State
Front Panel
Indicators
User Interface Display
Explanation
Boiler operates in standby
mode until demand for Central
Heat (CH) or Domestic Hot
Water (DHW) is detected.
CH or DHW pump is turned
on based on type of heating
demand.
(CH call is illustrated)
Control Module compares
supply Temperature to set
point. Boiler proceeds to
ignition if supply temperature
is less than set point.
Combustion Air Blower speed
modulates to pre-purge setting
for 15 seconds.
Sparking initiated sequence.
Heat
Demand?
DHW CH
Pump on
Supply
Temperature
<Setpoint?
15 Second
Prepurge
Ignition
Sparking
No
Yes
No
Yes
After 2 seconds
1.1 Front Panel Status Indicators
See Control Module Section for operational states of Front
Panel Indicators and User Interface Display.
POWER INDICATOR (Green) Light is lit when boiler power is ON.
HEAT INDICATOR (Green)
Light is lit when boiler is providing heat for CH or
DHW.
RESET INDICATOR (Red)
Boiler fault has been detected. Normal Operation
is suspended. Manual reset of boiler is needed.
Retrieve error code from User interface, follow
instructions in troubleshooting guide. See section 13.
1.4 Sequence of Operation
