EE1
FAULT CODE
Grant
High Pressure / Pump Failure / Airlock
High Severity
Engineer Required
On Grant heat pump models, EE1 indicates high pressure caused by circulating pump failure or an airlocked circuit. On oil boilers, this relates to circulation issues.
Step-by-Step Fix Guide
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Step 1
Check system pressure
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Step 2
Bleed radiators to remove airlocks
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Step 3 Engineer only
Call an OFTEC registered engineer to test the pump
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.