5-1
TROUBLESHOOTING
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
5.0 TROUBLESHOOTING
The troubleshooting section is divided into 3 sections:
•
Preliminary Checks
•
Electronic Components
•
Troubleshooting
Often, a problem can be identified and solved through simple checks of the basics:
confirming the electrical power supply, gas flow and resetting the thermostat control. To
extend the cover of such preliminary checks, the boiler’s touchscreen controller offers a
clear visual display of the status of the various control circuit components.
Should a problem remain unsolved after applying the preliminary checks, proceed to
the detailed system review, using the Troubleshooting section. It covers potential error
conditions grouped into the following categories:
• Using touchscreen controller errors displayed
• Ignition problems
• Cycling problems
• Temperature problems
• Miscellaneous
Below each section is a list of Symptoms, Diagnoses, and Remedies.
Also provided with this manual are a number of diagrams (see Section 6.0) for use with
troubleshooting including:
• Electrical wiring diagrams
•
Sequence of operations flowchart
• Boiler component diagrams
5.1 PRELIMINARY CHECKS
The first step in troubleshooting this system should be a review of the touchscreen
controller. There are a number of diagnostic features incorporated in the software that
evaluate system integrity, display error conditions and provide initial remedial actions.
In addition to checking the display, the following list is a guideline for troubleshooting:
1.
Confirm power to the boiler: check that the touchscreen controller display is on (e.g.
display is lit. The touchscreen controller’s display will be fully functional in 90 seconds
after power is restored to the boiler.)
2. Check that the boiler is not in a safety lockout.
3. Ensure wiring is clean and secure.
4. Check that gas is reaching the unit.
5.
Confirm that the water system is properly charged to 12 and that the pump is
serviceable.
NOTE
This boiler is equipped with a
blocked vent shutoff system,
which closes the gas supply
upon detection of an irregular
venting condition. In such
event, the electronic controller
will automatically carry out a
reset/ retry every 5 minutes.
See
Section 5.3.1 Airflow Error
for
Troubleshooting steps.
