Miscellaneous errors
Issue Diagnosis Fix
Error - Max. Inlet/Outlet Sensor Temp.
Exceeded. > Check water flow Water
temperature signal not within acceptable range.
Potential flow or sensor failure. Consult service
technician.
Current outlet
temperature
exceeds
operating limit.
Check water flow.
Defective or
disconnected
temperature
sensor.
Check wiring to
temperature sensor and
control module.
Check temperature
sensor.
Blank – screen dark, but fan running Indicative of
power-surge damage to appliance
Check transformer;
replace if damaged.
Check circuit board for
visible damage.
Controller is stuck in "service" mode after
software update.
If update fails
or no updates
applied.
Restarting returns the
boiler to normal
operation.
8.3.1 Ignition issues
Ignition issues
Issue Diagnosis Fix
Noisy spark when igniting Ignition lead is not firmly
connected.
Reconnect ignition lead.
Contaminants/moisture
on ignitor probe/flame
sensor.
Ensure probe is dry by re-running
post-purge; otherwise, clean or
replace ignitor probe.
Boiler rumbles when igniting. Fluctuating gas
pressure/ gas pressure
too high/too low.
Check CO
2
level via analyzer.
Check for proper gas
piping
Check pressure with manometer
during ignition.
Boiler will not attempt to ignite.
Fan and pump are operating
normally.
No power to ignition
control module.
Check system wiring.
Check air reference tubing.
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