Glow-worm Ultimate 30c runs a 5 V ratiometric transducer — the display board reads voltage directly.

None — the PCB self-references at 0 bar and 1.5 bar; recommission per OEM sheet.

Do I need to notify the manufacturer?

Only if the Glow-worm Ultimate 30c is in warranty — Glow-worm require log of any part swap for labour claims.

How to Replace the Pressure Sensor on a Glow-worm Ultimate 30c (UK)

Fit a new pressure transducer on Glow-worm Ultimate 30c when the display shows correct pressure at rest but locks out on heat-up.

The transducer on Glow-worm Ultimate 30c threads or clips into the hydraulic block. Drop pressure to zero before removal.

Refit with a new O-ring; over-tightening cracks the plastic body.

Refill the Glow-worm Ultimate 30c to 1.2 bar cold. Bleed high-point radiators and the internal AAV.

Run a full flue-gas analysis after 15 minutes. Log the reading against the OEM commissioning envelope in the Benchmark book.

Digital or analogue?: Glow-worm Ultimate 30c runs a 5 V ratiometric transducer — the display board reads voltage directly.
Calibration?: None — the PCB self-references at 0 bar and 1.5 bar; recommission per OEM sheet.
Do I need to notify the manufacturer?: Only if the Glow-worm Ultimate 30c is in warranty — Glow-worm require log of any part swap for labour claims.

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