BoilerFaultCodesIntergas 30 Fault Code
The Intergas 30 fault code means: your boiler has detected an internal electrical fault with the component that controls the gas supply, meaning it cannot safely start up to provide heating or hot water.. It appears on 11 Intergas models in our database.
Technical description: Gas valve relay faulty
What causes the Intergas 30 fault?
This fault occurs when the boiler detects that the water coming back from your radiators is much hotter than the water it just sent out, which shouldn't happen during normal operation. The most common reason is a lack of water flow caused by a blockage, trapped air, or a failing pump, but it can also be triggered if the electronic sensors that measure temperature become faulty and provide 'garbage' readings to the control board.
This fault is more common in autumn when heating systems are turned back on after a long summer break, as internal pump parts or radiator valves can seize up from disuse.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A cover plan would handle faults like 30: no call-out fees, no surprise bills.
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Intergas models that show the 30 fault code
Click a model for the full fault code list and model-specific repair notes.
- Combi Compact ECO RF Repair: £250-450
- Combi Compact HRE Repair: £180-350
- Combi Compact HRE 24/18 Repair: £250-450
- Combi Compact HRE 28/24 Repair: £250-450
- Combi Compact HRE 36/30 Repair: £200-350
- Combi Compact HRE SB Repair: £250-450
- Compact HRE OV Repair: £250-£450
- Rapid Repair: £200-350
- Rapid 25 Repair: £280-450
- Rapid 25 32 Repair: £280-450
- Rapid 32 Repair: £280-450
Source
Intergas 30 fault code information on this page is sourced and cross-checked against the official Intergas service / installation manuals for each affected model.
- Intergas Combi Compact ECO RF manual (PDF)
- Intergas Combi Compact HRE manual (PDF)
- Intergas Combi Compact HRE 36/30 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026