Dettson furnace runs but house air feels very dry and uncomfortable in winter.

Safety first: Turn off power and water supply to the humidifier before servicing.

• 1. Check for humidifier: If a Dettson-compatible humidifier is installed, verify it is turned on and set correctly.
• 2. Inspect water supply: Ensure the saddle valve or shutoff to the humidifier is open and water is flowing.
• 3. Verify wiring: Confirm the humidifier is wired to the correct HUM or accessory terminals on the Dettson control board.
• 4. Clean or replace pad: Replace the humidifier evaporator pad if clogged with mineral deposits.