IBC SFC-99 User Manual

5-1
TROUBLESHOOTING
SFC COMBI BOILERS SFC-99, SFC-125
5.0 TROUBLESHOOTING
The troubleshooting section is divided into four sections:
5.1 Preliminary Checks
5.2 Electronic Components
5.3 Warnings and Faults
5.4 Other Faults
Often, you can identify and solve a problem through simple checks of the basics:
conrming the electrical power supply, gas ow and resetting the thermostat
control. To help with preliminary checks, the unit’s control module 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 in this guide. The Troubleshooting chapter
covers potential error conditions, grouped into the following categories:
5.3.1 Warning Codes
5.3.2 Fault Codes
5.4.1 Burner does not Ignite
5.4.2 Burner Ignites Noisily
5.4.3 Burner Resonating
5.4.4 The Power is Reduced
5.4.5 No Space Heating
5.4.6 Indoor Temperature Does Not Reach Desired Temperature
5.4.7 No Hot Water (DHW)
5.4.8 Hot Water Does Not Reach Temperature
Below each section is a list of symptoms, diagnoses, and solutions.
Some diagrams (see Section 6.0) are included for use with troubleshooting
including:
• Electrical Wiring Diagrams
• Unit Component Layout Diagrams
5.1 PRELIMINARY CHECKS
As a rst step in troubleshooting, you should review the controller’s display
screen. Diagnostic features incorporated in the software evaluate system
integrity, display error conditions, and indicate initial troubleshooting action.
In addition to checking the controller’s display, try these troubleshooting steps:
1. Conrm power to the unit: check that control module display is on (e.g.,
display is lit).
2. Check that unit is not in a safety lockout.
3. Ensure that wiring is clean and secure.
4. Check that gas is reaching the unit.
5. Conrm that the water system is properly charged to 12 psig and that the
pump is serviceable.
NOTE
This unit is equipped with a
blocked vent shut-off system
that closes the gas supply
when it detects an irregular
venting condition.

IBC SFC-99 Specifications

General

Brand	IBC
Model	SFC-99
Category	Boiler
Language	English