IBC SL 20-160 G3, Installation And Operating Instructions Manual

Page: 61 / 90

5-1
TROUBLESHOOTING
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
5.0 TROUBLESHOOTING
The troubleshooting section is divided into 3 sections:
• 5.1 Preliminary Checks
• 5.2 Electronic Components
• 5.3 Troubleshooting Guide
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:
• 5.3.1 Using Control Module Errors Displayed
• 5.3.2 Ignition Problems
• 5.3.3 Cycling Problems
• 5.3.4 Temperature Problems
• 5.3.5 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 Layout Diagrams
5.1 PRELIMINARY CHECKS
The first step in troubleshooting this system should be a review of the controller’s
touchscreen. 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 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 psig, 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.