P a g e
13
CIRCUIT BOARD TROUBLESHOOTING
The Circuit Board is the electronic controller for the Water Heater. It is very reliable but it is often
diagnosed improperly and replaced. Note: in all cases the replacement of the Circuit Board is the
last item. We provide here a list of symptoms and their possible causes to help you to determine
if the problem is due to a malfunction of the board or other components.
1.
Dead
a.
Fuse/Circuit Breaker Bad
b.
Converter/battery bad
c.
Mis-wired – Check ‘On/Off’ Switch for Incoming Power
d.
No voltage @ POWER or BLOWER connections - Check for Broken Wire
e.
Bad circuit board: CONFIRM with Approved Board Tester such as Fenwal
part # 05-080224-009)
– Replace
2.
Flow Valve Activated - No Blower Output
a.
Mis-wired or Failed Sail Switch - Check Wiring
b.
Check Relay
c.
Check ECO
d.
Check Wiring to Board
e.
Defective or Stuck Flow Switch: Tap with Wrench; If Problem not Solved, Replace Flow
Switch
f.
Bad circuit board: CONFIRM with Approved Board Tester such as Fenwal
part # 05-080224-009) - Replace
3.
Sail Switch Input Okay - No Trial for Ignition
a.
Mis-wired
– Confirm Wiring and Connections
b.
Check Sail Switch for Continuity
c.
Bad circuit board: CONFIRM with Approved Board Tester such as
Fenwal part # 05-080224-009) - Replace
4.
Gas present but no Spark
a.
Misaligned Electrode – Ensure Gap Between Electrode Tip and Burner Blade is 1/8” and
into Path of Flame
b.
Check for Continuity on Electrode High Voltage Cable
c.
Check for Coil on Circuit Board
d.
Bad circuit board: CONFIRM with Approved Board Tester such as
Fenwal part # 05-080224-009) - Replace
5.
Spark present but no Gas
a.
Check Gas Supply
b.
Check Valve Connections
c.
Check for Proper Voltage - Minimum of 10.5 VDC
d.
Check Edge Connectors for oxidation - Clean and Replace
e.
Check Resistance (ohms) Draw on Coils - Should be 30 - 50 ohms