Aqua-Hot RV furnace fault codes
RV forced-air propane furnaces lock out after failed ignition attempts. Many use a status LED on the control board that flashes a fault pattern.
How to read the code
Find the control board (often behind an exterior access panel or inside under a vent) and watch the status LED. Count the flashes in each group; the pattern maps to a specific fault.
All documented codes
Fault Code 0 (1 blink) warning
The diesel-burner indicator light is not lit even though the diesel-burner switch is ON. T… Fault Code 1 warning
Low supply voltage detected by the diesel-burner controller. The 12V supply is below the m… Fault Code 8 warning
The burner failed to ignite on its initial start attempt, or the right high-limit thermost… Fault Code 9 warning
Re-ignition failure. The burner lit and established a flame, the flame then went out durin…
The diesel-burner indicator light is not lit even though the diesel-burner switch is ON. T… Fault Code 1 warning
Low supply voltage detected by the diesel-burner controller. The 12V supply is below the m… Fault Code 8 warning
The burner failed to ignite on its initial start attempt, or the right high-limit thermost… Fault Code 9 warning
Re-ignition failure. The burner lit and established a flame, the flame then went out durin…