ASKO Dryer Error Code H3

The H3 code on an Asko gas dryer means the flame detector circuit was detected as open for 300 seconds before igniter operation began. This indicates the control board cannot confirm the flame detector is functioning, so it stops the ignition process as a safety precaution. The dryer will not heat until the fault is diagnosed and corrected.

The dryer will not produce heat while the H3 fault is active, so it will not run a normal drying cycle. The code is a safety feature designed to prevent ignition attempts when the flame detection circuit is not functioning. You should not attempt to bypass or ignore the fault, and the issue should be repaired before returning the dryer to service.

Repair costs vary depending on what is causing the fault. If only a loose connector is involved, there may be no parts cost at all, though a service call to diagnose it typically runs in the range of $75 to $150. Replacing the flame detector itself usually adds a parts cost in the range of $20 to $80 depending on availability. If the control board is at fault, costs can be significantly higher, often $150 to $350 or more for parts and labor.

Start by checking that the flame detector is firmly attached to its wiring harness connector, since a loose connection is the most common cause. If the connection is secure, inspect the wiring for any breaks or corrosion, and test continuity along the circuit. If wiring is intact, the flame detector itself may need to be replaced. A qualified technician should handle any gas appliance repair if you are not comfortable working with these systems.

A reset may temporarily clear the displayed code, but if the underlying fault in the flame detector circuit has not been repaired, the H3 error will return as soon as the dryer attempts another heat cycle. The root cause, whether a loose connection, damaged wiring, or a failed flame detector, must be addressed for the error to clear permanently.