5-5
TROUBLESHOOTING
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
4. Tap the LWCO Test button.
5. Disconnect the yellow wire from the LWCO function.
A message on the screen indicates that the boiler is in lockout mode.
6. To reset the boiler, reconnect the yellow wire to the LWCO function.
On the touchscreen controller, tap the Reset button.
The message: "The SIM Module has been reset" is displayed.
7. Tap the Close button, and then tap the Back button until you return to the Home
screen.
5.2.4.2 Water Temperature function: reset and test
The hi-limit temperature function monitors the hi-limit temperature set in the SIM. If
the water temperature exceeds the hi-limit temperature, the boiler goes into a lockout
condition (locks), requiring a manual reset. You can test the hi-limit cutoff temperature
function on the boiler.
Resetting the boiler after a Hi-Limit 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.
3. Tap the Advanced Diagnostics button.
4. Tap the Clear Errors button.
5. Tap the Yes radio button, and then tap OK.
The system clears the errors, and resets the boiler.
Testing the Hi-Limit cutoff temperature function
1. On the touchscreen controller, tap the Home screen.
2. On the Main Menu, tap the Diagnostics button.
3. Tap the SIM Module button.
4. Tap the Hi-Limit Test button.
You will need to enter a cutoff temperature below the Supply Temp. value currently
displayed. For example, if the Supply Temp. value is 180°F, enter 170°F in the Cut Off
Temp. box.
5. Tap inside the Cut-Off Temp. box, and then tap a number value.
6. Tap the OK button.
The message: "Hi-Limit Detected" is displayed.
7. To reset the boiler, select the Reset button.
The message: "The SIM module has been reset" is displayed.
8. Tap the Close button, and then tap the Back button until you return to the Home
screen.
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