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Heat pumps
Heat pumps · Error codes

Lailey and Coates Ltd heat pump error codes

Lailey and Coates Ltd · A niche brand in the UK. 5 codes across 1 product family, each taken from the manufacturer’s manuals. Lailey and Coates Ltd technical support ↗

Find a Lailey and Coates Ltd engineer →5 codes · reviewed 23 September 2026

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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.

5 codes

CodeMeaningStops?Homeowner check?
E01
Communication failure between outdoor unit and control box
YesYes
E02
LCD controller communication failure
Not statedYes
E03
Outdoor unit inverter module communication failure
YesYes
P04
High Pressure Protection fault
YesYes
P15
High Pressure Protection fault
YesYes