Suburban RV fault codes

Suburban makes RV furnaces and water heaters. Many faults are signalled by a lockout (no ignition) rather than a numeric code, diagnosed from the symptom.

Furnace

High-limit lockout
The high-temperature limit switch is a normally-closed s… Ignition lockout
Suburban NT and SF series RV furnaces do not display a n… Low-voltage standby
The Fan Control module board continuously monitors suppl… Sail switch lockout
On the 12 VDC Fan Control module board, after the thermo…

Water Heater

DSI lockout
Suburban gas (DSI) water heaters do not show a numeric f… Electric ECO tripped
On gas/electric (DE) models, the 120V electric heating c… Electric element no heat
On gas/electric models, the 120V element produces no hea… Gas ECO tripped
The gas-side ECO (Energy/Electric Cut Off, a high-limit … Gas valve won't open
The board is sequencing and spark is present, but the ga… No reset light
On a DSI SW-series unit, the reset light failing to come… No spark / no ignition
The control board is powered and attempting to light (re…