BoilerFaultCodesThe 6 most common faults
Your boiler is trying to start up but cannot light the gas flame needed to provide heat and hot water.
Check if other gas appliances, like a cooker, are working to ensure gas is reaching the propertyVerify that your gas cupboard valves are open or that you have credit on your meterPress the Reset button on the boiler control panel once to see if the system restarts
Your boiler has started to heat up but the flame has unexpectedly gone out, causing the system to shut down for safety.
Check that your gas emergency control valve is open and you have credit on your gas meterCheck if other gas appliances in your home, such as a hob, are working correctlyReset the boiler by following the instructions in your user manual
Your boiler has stopped working because it cannot detect a flame or has lost its electrical connection, meaning you currently have no heating or hot water.
Check if other gas appliances, like a hob, are working to ensure gas supply is activeEnsure the boiler is plugged in and the fused spur switch is turned onCheck your consumer unit/fuse box for any tripped switchesPress the Reset button on the boiler control panel
Your boiler is struggling to circulate water properly, causing it to shut down shortly after it lights.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop to top it up.Ensure all radiator valves and external isolation valves are fully open.
Your boiler has detected that there is not enough water flowing through the system or there is insufficient water pressure to operate safely.
Check the pressure gauge on the front of the boiler; it should ideally be between 1.0 and 1.5 bar.If the pressure is below 1.0, use the external filling loop to top up the system with water until the gauge reaches 1.2 bar.Ensure all radiator valves are open and that the pump is not making loud grinding noises.Reset the boiler to clear the fault code once the pressure is restored.
Your boiler has no power and the screen is blank, meaning it cannot operate at all to provide heating or hot water.
Check if the boiler's power switch is turned onCheck your home's main fuse box (RCD) to see if a circuit has trippedCheck the fuse in the boiler's fused spur switch (the wall switch near the boiler)
on the Dimplex Combi 38
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Dimplex shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue