Baxi
Bahama
| Problem | Solution |
| No heating | Domestic flow switch can stick on, disconnect wire and if heating comes on change flow switch |
| Intermittent faults | Primary flow switch can stick on, off, and in betweenm there is a retro fitting spring available to make sure it returns to the correct position |
| Lockout | Ignition boards can give a weak spark |
Combi 80 and 105
| Problem | Solution |
| Overheat problems | There is a strainer filter inisolation valve on the right in the return isolation valve, these clog up |
| Lockout on heating | Check low gas setting on modureg is set correctly |
| Low water temperature after new PCB | Check potentiometer knob is not fitted 180 degrees the wrong way, there is a right and wrong way to fit these |
Combi Instant
| Problem | Solution |
| High pitched squealing noise | There was a modification by Baxi in 2003 to the differential and diverter valve o-rings |
| No or poor hot water | Check the water differential valve is operating correctly, if it fails to work the water will bpyass the plate heat exchanger and go round the main heat exchanger and expansion storage vessel only. |
| Reset problem new PCB | Hold in the reset position for at least a minute as they normally come in the failed position from the manufacturers. |
| Expansion Vessel | The instant range has an integrated storage within the expansion vessel, there are two connections not one as per normal. |
| Reset problem | Turn the hot water and heating potentiometer to full, and run a tap, now hold reset position for five seconds |
Duo Tec Combi HE
| Problem | Solution |
| E133 | Spark electrode can bend causing incorrect spark gap |