Dometic Harrier Not Heating Service Prep

Use this official Dometic source when a Harrier air conditioner is not heating well before contacting support.

Owner-safe checklist

Record the Harrier model, outside temperature, selected heat mode, fan setting, elapsed runtime, and whether cooling mode still operates.
Save photos of the control state, remote if used, safe visible product label, and the official Dometic support title you matched.
Keep roof access, sealed cooling-system work, and high-voltage component service for qualified RV service; shut the unit down and use qualified RV service for repair.