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A�6 Operation
• When water temperature reaches setpoint, controller
ends heating cycle.
• When water temperature drops below setpoint minus
differential, controller restarts heat cycle to re-heat
boiler water.
• If water temperature exceeds maximum allowed
temperature (220°F or 104°C), controller enters manual
reset lockout state.
• For models having reset capability, press any onboard
button or cycle power to reset.
Figure A-4 - Basic Control Algorithm Example
APPENDIX A - CONTROL MODULE
A�7 Boiler High Limit Temperature Controller
• Following service procedures are provided as general
• On lockout and retry models, meter readings between
• Check for correct installation and wiring before replacing
• Control module cannot be repaired. If it malfunctions, it
• Use only qualified service agent to service ignition
1.
2.
3.
4.
A�8 Troubleshooting
Integrated boiler control uses advanced diagnostic
capability to assist in troubleshooting error conditions.
Figure A-2 shows codes that could arise on integrated
display during fault.
Suggestions are provided in Table A-2 for servicing these
potential errors.
38
guide.
gas control and ignition module must be taken within
trial for ignition period. Once ignition module shuts
off, lockout models must be reset through key buttons
and display. On retry models, wait for retry or reset at
thermostat.
any component.
must be replaced.
systems.
Perform checkout as first step in troubleshooting.
Check troubleshooting guide to pinpoint cause of
problem. See Table A-1.
If troubleshooting indicates ignition problem, see
Ignition System Checks to isolate and correct the
problem.
Perform checkout procedure following troubleshooting
guide again to verify system is operating normally.
PN 240013099 Rev. B [08/08/2023]
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