Floaire Heating Discharge

What does Floaire Heating Discharge mean?

The make-up air unit's control board logs a heating discharge fault when there has been no delta-T for 30 minutes. In other words, the board expected the discharge air temperature to change while heating but detected no temperature difference over a half hour. The fault is stored in the View Faults menu, is retained through a power loss, and stays listed until the cause is fixed and the fault is cleared.

Symptoms

• Heating discharge fault stored in the View Faults menu
• No change in discharge temperature while heating is called
• Fault retained even after the board loses power

Common causes

• No delta-T detected at the discharge for 30 minutes during heating
• Heating stage not firing or not producing heat
• Discharge temperature sensor fault or misplacement
• Insufficient or no airflow across the heating section

Diagnostic steps

1. 01

   Confirm heating is operating

   Verify the heating stages are being commanded on and are actually producing heat.

2. 02

   Check airflow through the unit

   Ensure adequate airflow across the heating section, since no airflow prevents a discharge temperature change.

3. 03

   Inspect the discharge sensor

   Confirm the discharge temperature sensor is connected and correctly positioned to read discharge air.

4. 04

   Resolve, then clear the fault

   After restoring a measurable delta-T, use Clear Faults; an unresolved condition can bring the fault back.

When to call a professional

Call a qualified HVAC technician if heating does not fire, produces no measurable temperature rise, or the fault returns after sensor and airflow checks. Diagnosing a heating section that will not produce a delta-T involves fuel or electric heat, line-voltage controls, and the discharge sensor circuit; this work should be performed by a professional trained on direct-fired or make-up air heating equipment.