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

QTS Series
38
5.0 Maintenance • Troubleshooting Guide
Continued from page 36.
Troubleshooting ends.
Do the burners stay on for approx.
15 seconds and then shut off?
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.