Proheat X45–School Bus - Manual (Page 72)

5-15 SECTION 5. TROUBLESHOOTING & REPAIR
Indicates that a flame was detected (started successfully for at least 60 seconds)
but is unable to maintain a steady flame before reaching the cycle off
temperature of 185°F (85°C).
Flame Out sequence:
a) A flame is detected during the Ignition period and during Full Output.
b) The flame goes out or fails to be detected.
c) The ignition is switched on for a maximum of 10 seconds to try and
reestablish the flame.
d) If the flame is not detected within 10 seconds, the Flame Out diagnostic
code is displayed.
e) The PROHEAT goes into Cool Down (Purge) mode and attempts to restart
after Cool Down (Purge) is complete.
A Flame Out diagnostic code distinguishes that:
a) A flame was detected therefore there was a spark and the Ignition
system works.
b) The flame was detected therefore the Flame Sensor works.
c) The fault is in the fuel supply system.
d) The Flame Sensor could be dirty.
Troubleshoot the Flame Out diagnostic code based on:
1 Fuel supply to the PROHEAT.
Go to page 5-6 and perform Fuel Systems Steps 1 to 5.
• Fuel tank pick-up.
• Fuel fittings.
• Fuel lines.
• OEM supplied filters and check valves.
2 PROHEAT fuel and flame detection system.
Go to page 5-7 through page 5-14 and perform Fuel Systems Steps 2 to
5, Ignition System and Flame Sensor checks.
• Fuel Supply Pump
• Air Compressor – pressure
• Fuel Regulator – dirty or clogged
• Nozzle – dirty or clogged
• Flame Sensor – dirty
3 Operational symptoms that may occur in conjunction with a Flame Out code.
Go to page 5-37.
• Combustion hesitation or coughing.
• Backfiring.
• Smoke.
• Strong diesel fuel odor.
2 Flame Out