5-1
TROUBLESHOOTING
SFT 199 TANKLESS WATER HEATER
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:
confi rming the electrical power supply and gas fl ow. To help with preliminary
checks, the unit’s control module offers a 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 Hot Water (DHW)
5.4.6 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
•
Water heater component layout diagrams
5.1 PRELIMINARY CHECKS
As a fi 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.
Confi 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.
Confi rm that the domestic water system is properly charged to a minimum 40
psig.
NOTE
This appliance is equipped
with a blocked vent shut-off
system that closes the gas
supply when it detects an
irregular venting condition.
