BoilerFaultCodesIntergas 30 Fault Code
The Intergas 30 fault code means: your boiler has sensed that the water returning to it is significantly hotter than the water going out, which usually means there is a blockage or a sensor error causing the system to stop for safety.. It appears on 10 Intergas models in our database.
Technical description: Return temperature > flow temperature + 40 K (60 K for solar).
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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →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: £120-350
- Combi Compact HRE 24/18 Repair: £120-350
- Combi Compact HRE 28/24 Repair: £120-350
- Combi Compact HRE 36/30 Repair: £120-350
- Combi Compact HRE OV Repair: £120-350
- Combi Compact HRE SB Repair: £120-350
- Compact HRE OV Repair: £250-£450
- 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.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026