8.1.4.1 Table showing LED operating status
Its two status LEDs indicate the operating status as shown in the table below.
SIM Status Indicators
LED 1 LED 2 State
Description, LED status
indication
Rapid flash Rapid flash Power up or
resetting
Startup checks and initialization
Off Off Standby
LED 1 Off = No flame or sparking
LED 2 = Burner-on call state
Off On Pre-purge or
inter-purge
LED 1 Off = No flame or sparking
LED 2 = Burner-on call state
On On Heating
LED 1 On = Flame detected
LED 2 = Burner-on call State
Rapid flash On Igniting
LED 1 Flashing - Electrode sparking
LED 2 = Burner-on call state
Off Flashing Lockout
Possible errors:
An operating limit was
exceeded
A sequence failed
An external sensor fault was
detected.
Flash alternately
with LED 2
Flash alternately
with LED 1
Fail-safe An error was detected - the boiler
requires a power cycle
Table 14 SIM+ LED status Indicators
8.2 Troubleshooting error messages
Warning
Never attempt to repair the control module (circuit board). If the control module is
defective, replace it immediately.
Errors shown on the touchscreen controller are described below as well as diagnoses and fixes.
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