INSTALLATION AND OPERATION INSTRUCTIONS
5-8
SL 80-399 MODULATING GAS BOILER
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
SYMPTOM
DIAGNOSIS
REMEDY
TEMPERATURE SENSOR
ERROR
Touchscreen Message:
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. S
ee Section 5.2.1.
MISCELLANEOUS
Touchscreen Message :
Blank – screen dark, but fan
running Indicative of power-
surge damage to appliance
• Check transformer; replace if damaged.
• Check circuit board for visible damage.
5.3.2 Ignition Problems
SYMPTOM
DIAGNOSIS
REMEDY
NOISY SPARK WHEN
IGNITING
Ignition lead is not firmly
connected.
Reconnect ignition lead.
Contaminants/moisture
on igniter probe/flame
sensor.
Ensure probe is dry by re-running post-purge;
otherwise, clean or replace igniter 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.
Igniter probe/flame
sensor disconnected.
Reconnect probe.
Defective Control
Module.
Check ignition output from control module.
BOILER WILL NOT ATTEMPT
TO IGNITE. FAN AND / OR
PUMP ARE OFF DISPLAY
NOT ILLUMINATED
No power to boiler.
Check line voltage.
Defective transformer.
Check transformer. Reconnect or replace as needed.
