Firebird Thermostat Pocket ACC003PKT

The Firebird thermostat pocket is a brass pocket that holds the boiler thermostat or temperature sensor in contact with the water in the appliance. It is listed by Firebird under part number 555012 and is used across the Envirogreen range of oil-fired boilers. The pocket protects the sensor from direct contact with system water while still allowing it to read the flow temperature.

• The thermostat or sensor sits loose in the pocket and no longer makes firm contact with the pocket wall.
• Temperature readings are erratic, or the boiler short cycles because the sensor response is delayed.
• The pocket is scaled, corroded or pitted internally, preventing the sensor from seating correctly.
• There is weeping or staining at the pocket where it screws into the boiler.
• The pocket has been distorted or damaged during sensor removal or refitting.

• Confirm the size designation 15 x 16 matches the tapping and sensor on your appliance.
• Check your boiler model against the fitment list above before ordering.
• Inspect the existing sensor and its lead, as a faulty sensor can produce the same symptoms as a faulty pocket.
• Confirm how many pockets your appliance requires, as the manufacturer description references a 3 pocket configuration.