Detroit Radiant Products Company QTD Series - Manual (Page 38)

QTD Series
38
Troubleshooting ends.
5.0 Maintenance • Troubleshooting Guide
Do the burners stay on for approx.
15 seconds and then shut off?
Continued from page 36.
Do the burners come on and turn
off immediately (1 to 2 seconds)?
Test for 24V at valve opening period (usually 7 to 10 seconds
after power to heater). Is there 24V to valve for 15 seconds?
Yes
The following can cause the heater to shut down:
• Improper grounding.
• High winds.
• Dirty environment.
• Fluctuating gas pressure.
Do the burners
stay on?
No
Does the heater stay on
until the call for heat ends?
Yes
Yes No
No
Yes
No
Diagnostic Indicator
LED MODE
1 Flash Start up.
2 Flashes Flame. No call for heat.
3 Flashes Ignition lockout.
4 Flashes Valve relay lockout.
Replace circuit board.
Yes No
Yes
Yes
No
Contact factory.