Recent content by zk

Make sure the condensate discharge pipe is not blocked, also make sure the discharge pipe has a continious fall going away from the boiler, including the flexible pipe below it. Some of the earlier capriz boilers needed a modification to be fitted to the condensate trap. If the discharge pipe is...

Also make sure the contacts to the switch are not shorting due to moisture or condensation within the boiler.

I think you have to change the DHW flow switch when changing the pcb on these, something to do with the old style switch not being compatable with the new board. Give Ariston a call tomorrow to confirm if nobody else can on this forum. Tel 01494 755600

yes you can get the gland nuts you require seperatly. Which model of Biasi is it?

get a registered gas engineer to check the flue, hoses from the fan to the air pressure switch and the aps.

The burner pressure is higher on HW demand as appossed to CH demand, so if there as a scale or sludge problem the boiler will kettle quicker.

check for reversed polarity, also rectification probe and lead to pcb having continuity if all ok then youll find its the ignition board.

Sounds like a blocked plate heat exchanger for the hot water problem, if the boiler is continually cycling on/off when the hot water tap is running. Rads not getting hot could be trv's playing up on the rads , system needs balancing or sludge in the system causing circulation problems.

Are you sure he didnt say the actuator motor?

Does the boiler fire up when there is a demand for hot water only? whilst the hot tap is open does the burner cycle on/off? and do the other radiators get hot apart from the two that don't?

Gassafeman, the condensing ones have a filter in the plate to plate, and your right a pain to remove the filter sometimes, the non condensing ones didnt have the filter in the plate.

does the burner light up or are you just hearing the pump and the fan running? if the burner lights up then how long does it stay on for, and does the ch flow pipe start to get hot if the burners on?

does the boiler fire up when there is a call for heating?

most likely to be the ignition board, provided the fan venturi and the aps have been checked, you will need a RGI to do these checks.

Thermo thank you for your advice and a quick reply.