The furnace runs but does not produce enough heat, and rooms remain cold.

Safety: Controls can be adjusted by the user, but combustion settings must not be altered.

Steps:

• Check thermostat: Ensure room thermostats are set above the current room temperature and are calling for heat.
• Heating curve: On the Weishaupt WCM controller, review the heating curve or setpoint settings. Increase them slightly within the recommended range if the building is consistently underheated.
• Air filters: For warm air furnaces, replace or clean clogged filters to restore airflow.
• Bleed radiators: For hydronic systems, bleed radiators to remove air and improve heat transfer.

If heat remains inadequate, a technician should check the burner output, combustion settings, and system design.