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DIAGNOSTICS
A. Ignition Control Diagnostic Codes
• The following chart gives the diagnostic codes given by the ignition control when faults are present. An LED light, located in the
middle of the control board, will flash the codes indicated in the diagnostic chart. There is a standard of three tries for ignition
controls.
• A "so lockout" is a condition that is timed and will make additional attempts to correct the problem.
• A "hard lockout" requires resetting the thermostat or turning the power switch off, and then back on.
DIAGNOSTIC CHART
FAULT LED INDICATION LOCKOUT
Internal Circuit Board Failure Steady On, No Flashing Hard
Limit Switch/Airflow Problems 1 Flash With 3-Second Pause Soft
Flame Sense Fault 2 Flashes With 3-Second Pause Hard
Ignition Lockout Fault 3 Flashes With 3-Second Pause Soft (1 hour retry)
TROUBLESHOOTING
ISSUE SOLUTION
Furnace will not light – Blower does not
turn on.
1. Check the main fuse panel for a blown fuse.
2. The Furnace-installed breaker switch may be tripped or OFF – Contact a trained RV
service provider.
3. The 12 VDC power is low; check the RV system voltage.
4. The Furnace may be in lockout. Reset the Furnace by switching the thermostat to OFF
for 10 seconds, then switch the thermostat to ON. If air is in the propane line, repeat this
process up to three times.
5. Check the intake and vents to make sure they are not blocked or obstructed.
Furnace will not light – Blower does turn on. 1. Air is in the propane line. Purge the air by turning on other appliances (like a cooktop) that
are further downstream from the propane tanks.
2. The thermostat is not set to Heat or a high enough temperature. Adjust the thermostat.
Furnace shuts off before it reaches the desired
temperature.
1. Check to make sure all the vents are open and not covered.
2. Check the air intake to make sure it is not blocked or obstructed.
REPLACEMENT PARTS
ELECTRICAL SHOCK, FIRE, EXPLOSION AND/OR CARBON MONOXIDE HAZARD. Use only Dometic replacement
parts and components, which are specifically approved for use with the Furnace. Failure to obey this warning could result in
dangerous operation, property damage, serious injury, or death:
• For replacement part information, see the DF Series Furnace Parts List. For the most current information, visit
www.eDometic.com.
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