8.2.6.1 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 13
SIM LED status Indicators
8.2.6.2 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.
109
8.2.6 Safety and Ignition Module (SIM)
Summary of Contents for EX Series
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Page 121: ...Appendices Wiring diagrams Figure 73 Controller electrical diagram 119 Appendices...
Page 122: ...Figure 74 Internal wiring diagram EX 400 and EX 500 models 120 Section Appendices...
Page 123: ...Figure 75 Internal wiring diagram EX 700 and EX 850 models 121 Wiring diagrams...
Page 124: ...Figure 76 Sequence of Operation 122 Section Appendices...
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Page 128: ...126 Boiler parts diagram EX 400 and EX 500...
