Boiler is running in pre-heat mode which ensures fast delivery of DHW. Pre heat occurs every 1h30m and lasts for approximately 1 minute. This is a normal function. If code keeps coming on a lot more regularly, suspect dripping taps A preheat disablement kit is now available as an optional extra. This will disable the preheat - if this kit is fitted the hot water will take longer to reach temperature

Boiler is running in DHW mode. If no taps are open, check for dripping taps if no dripping taps or leaks engineer visit required.

Boiler is running in DHW mode and satisfied on user control temperature. If no taps are open, check for dripping taps as this will cause the boiler to operate in hot water mode when not required.

Boiler is in standby mode. Has no call for CH or DHW

• Ensure Programmer is in the ON mode for CH.
• Set room stat to maximum
• Set Ch control knob to maximum.

If display still shows "0" contact installer

Boiler waiting to come on for central heating, but boiler thermostat satisfied. External controls/Room thermostat still calling for heat

Boiler closing down for CH. Pump overrun. (Pump needs to continue running for approx. 5 min's to allow boiler to cool down).

Boiler should be running in heating mode. If radiators are not getting hot, ask to check all radiator TRV's are open. If radiators are still not getting hot - Engineer visit required.

Communication fault with front user display, attempt reset by turning power off then back on.

If fault remains - Engineer visit required.

Communication fault with front user display, attempt reset by turning power off then back on. If fault remains - Engineer visit required.

Only occurs on boilers produced after 2007 after L9 is reset. Indicates boiler is cooling down. Has to be below 50C before boiler will fire. Boiler can take approx 30mins to cool down please ensure system pressure exceeds 1 bar and all TRV'S are open during this period

Blank Display see further information

p indicates boiler is in frost protection mode, if the temperature at the boiler falls below 5C the pump will run to circulate water around the heating system. (only on boilers produced from 2007)

Normal boiler operation mode.

If the temperature at the boiler continues to fall below 3C the boiler will fire to raise the temperature back above 5C.

This mode will operate more frequently when boilers are fitted in exposed areas e.g... Garages / lofts (only on boilers produced from 2007)