LOW WATER TEMPERATURE High

Potterton LOW WATER TEMPERATURE Fault Code

Also written as LOWWATERTEMPERATURE — same fault.

The Potterton LOW WATER TEMPERATURE fault code means: your boiler is struggling to heat the water to the correct temperature because there is an issue with how it manages its internal gas flow.. It appears on 1 Potterton model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: 1. Gas pressure too low. 2. Faulty diaphragm. Will also cause a high water rate. 3. Automatic gas valve push rod sticking. May also cause a high water rate. 4. Slow ignition screw incorrectly set. Will also cause a high water rate.
Typical repair cost £150-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Potterton models that show the LOW WATER TEMPERATURE fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Potterton LOW WATER TEMPERATURE fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026