Hamworthy Air Damper Spring Upper 539001069

The AIR DAMPER SPRING - UPPER. SHORT & STOCKY is a Hamworthy gas boiler spare, listed as a spring extension (reference SS5162). It sits in the upper position of the air damper assembly, where the spring tension controls the movement of the damper flap in response to the boiler's air demand. It is supplied for the Hamworthy Wessex 100HE high efficiency floor standing boiler.

• The air damper flap fails to return to its resting position when the appliance stops firing.
• The damper flap rattles or chatters in service instead of sitting under steady tension.
• Combustion readings drift outside the expected range for the appliance.
• The spring is visibly stretched, kinked, corroded or has lost its coiled shape.
• The boiler locks out or runs erratically for reasons traced to air damper operation.

• Confirm the appliance is a Hamworthy Wessex 100HE high efficiency floor standing model.
• Check the part number 539001069 against the marking or documentation for the spring being replaced.
• Confirm the failed spring is the upper spring, as the assembly uses more than one spring position.
• Compare the removed spring's coil length and diameter with the replacement before fitting.