Intergas · HRE, ECO RF & Rapid with iC3 PCB
0.0Low system water pressure
This code applies to Combi Compact HRE 24/18, Combi Compact HRE 28/24, Combi Compact HRE 36/30, Combi Compact HRE 36/40, ECO RF, Rapid 25, Rapid 32. Fault codes narrow down the likely problem, but they do not replace a model-specific diagnosis.
What you can safely check
- Check the pressure gauge with the system cold.
- If it is below the range stated in the boiler manual, repressurise only by following that model's user instructions.
- Stop and book an engineer if pressure drops again, rises excessively, or there is a visible leak.
How an engineer may fix it
Check for leaks, trapped air, the pressure sensor, pump and expansion vessel; repair the underlying fault before recommissioning.
Manufacturer source: Intergas — HRE, ECO RF & Rapid Parameters and Fault Codes (V10). Checked 15 August 2026. The appliance manual and an engineer’s on-site diagnosis take precedence. Never remove the boiler case yourself.