How to troubleshoot electronic board on WH?
Suddenly this morning DW went to take hot shower and the water was only warm, what is from yesterdays sun. It is Suburban WH and shows red light on control panel all the time. I bypassed thermo swit...
Forum Discussion
Start by tracing the DC path.
RED (Fault) Light ON means it 'failed' to light off main flame & PROVE it lit
With ON/OFF Switch ON you should have DC from switch to the t-stats
From t-stats to module
Then from module to gas valve and spark electrode (DC on gas valve for 6-8 seconds WHILE spark electrode is firing CLICK CLICK CLICK)
If water temp is hot (130*F) normal t-stat (bottom one)will be OPEN...no DC to module
Normal t-stat closes when temp goes below 100*F so NO DC to module until water cools off/t-stat closes
Main flame (gas valve solenoids get DC) lights off ----milliamp signal is generated that must go back to module to keep DC on gas valve until t-stat opens
SO do you have DC to/thru the set of t-stats?
Does the spark electrode fire....gas valve solenoids get energized?
Trace the DC..THEN replace/fix vs trowing parts at it
Simple DC Test light can be used to trace DC.
Voltmeter better cause you can measure actual DC Voltage
Issue could be dirty connections, bad spark electrode, bad ground(s), bad module
RED (Fault) Light ON means it 'failed' to light off main flame & PROVE it lit
With ON/OFF Switch ON you should have DC from switch to the t-stats
From t-stats to module
Then from module to gas valve and spark electrode (DC on gas valve for 6-8 seconds WHILE spark electrode is firing CLICK CLICK CLICK)
If water temp is hot (130*F) normal t-stat (bottom one)will be OPEN...no DC to module
Normal t-stat closes when temp goes below 100*F so NO DC to module until water cools off/t-stat closes
Main flame (gas valve solenoids get DC) lights off ----milliamp signal is generated that must go back to module to keep DC on gas valve until t-stat opens
SO do you have DC to/thru the set of t-stats?
Does the spark electrode fire....gas valve solenoids get energized?
Trace the DC..THEN replace/fix vs trowing parts at it
Simple DC Test light can be used to trace DC.
Voltmeter better cause you can measure actual DC Voltage
Issue could be dirty connections, bad spark electrode, bad ground(s), bad module
