Troubleshooting guide
Dometic water heater P/T relief dripping or lost air gap
Use this when a Dometic/Atwood tank water heater drips from the pressure-temperature relief outlet and Dometic air-gap guidance may apply.
Use this atlas to identify likely meaning and prepare for service. Shut off power, LP gas, fuel, or water when a listed appliance condition involves flame, gas smell, exhaust, generator shutdown, high temperature, moving jacks/slides, refrigerant, 120 VAC, control boards, repeated ignition failure, or a persistent lockout. Call the appliance maker, RV dealer, or a qualified RV technician for repair.
Owner-safe checklist
- Turn the water heater off and let stored water cool before following Dometic air-gap instructions.
- Record whether the P/T relief outlet drips only while heating or continues after cooldown.
- Do not cap, plug, restrict, or ignore the P/T relief outlet.
- Call qualified service if discharge repeats, the relief valve is corroded, or any valve or plumbing part needs replacement.