Safety: Isolate water supply and electrical power before removing any pressurised components.

Steps:

Check inlet filter: Many Gledhill mains‑pressure units have a strainer on the cold inlet combination valve or pressure reducing valve. Close the inlet valve, remove the filter, and clean any debris.
Inspect pressure sensor: Locate the pressure transducer on the cold inlet manifold. Check for leaks, corrosion, or damaged wiring.
Electrical test: With power off, unplug the sensor and inspect the connector. With power on (only if competent), measure the sensor output voltage according to the service manual. A flat 0V or 5V reading may indicate a failed sensor.
Replace sensor: If the sensor is faulty, depressurise the system, unscrew the sensor, fit a new sealing washer or O‑ring, and tighten to the specified torque. Refill and check for leaks.

Note: After sensor replacement, some models may require a power cycle or reset procedure to clear E10.

E10 displayed, no hot water, cold mains pressure appears normal

Possible Causes