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.
83
7.2.6 Safety and Ignition Module (SIM)