7.2.6.1 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 Power up or resetting startup checks and initialization
Off Off Standby
LED 1 Off=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
Rapid flash On Igniting
Off Flashing Lockout
Flash alternately with
LED 2
Flash alternately with
LED 1
Fail-safe Boiler requires a power cycle
Table 11 SIM LED status Indicators
7.2.6.2 Low water cutoff function: reset and test
The low water cutoff (LWCO) function provides continuous protection against a low water incident.
If the SIM detects a low water incident, the boiler goes into a lockout condition. To clear the lockout condition
in the controller, go to Diagnostics>Advanced Diagnostics>Clear Errors. To test the LWCO on the boiler,
you can also manually place the boiler in a lockout condition.
7.2.6.3 Resetting the boiler after a LWCO lockout
Before you reset the boiler, ensure that the boiler is pressurized and that the air has been removed.
1. On the touchscreen controller, tap the Home screen.
2. On the Main Menu, tap the Diagnostics button.
7.2.6 Safety and Ignition Module (SIM)
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