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I need to change the drain valve on a Biasi Prisma combi. A local supplier has one for an Ariston that he thinks will fit. Not only does it look like the original one that came with the Prisma but its also only a third of the price of the Biasi one. I changed the original one many...

I used to have this problem a few years ago - It was the fan that used to stick after several months and worked well after a dose of wd40 - eventually I changed it for a new one and have had many years of bliss until now However last time it was not intermittent. It was fairly obvious that...

I was having problems with CH and it turned out to be muck in the DV. I removed DV and rinsed it out and the boiler now works but locks out occasionally. The boiler is 15 years old so I thought next best thing to a new DV would be to fit a service kit. Biasi also advised that. I returned...

I have not yet taken the assembly out. This is because as mentioned in my post I have doubts about the kit. However, I have removed the DV in the past WITHOUT removing the gas valve fairly easily but did not disassemble the DV. The way I see it, the springed assembly (in the service kit)...

Thank you for reply: I have received: 1 x big diaphragm - for HW actuator 1 x small diaphragm - for CH 1 x spring loaded spindle assembly 1 x pin guide bush 1 x spindle for actuator side 1 x retainer nut with grub screw hole 1 x nut with tapped hole for guide bush (DHW switch side) I...

I bought a service kit from ebay advertised as BI1011504 original part. The kit is for the water section which I intend to fit this weekend. However, the spring loaded bit which is meant to push out a pin to make the DHW switch does seem to have enough movement to achieve this function...

good continuous hot water? Yes Central Heating? - yes and no Because when Dial set to snowflake and CH dial set to FULL, the temp climbs from cold to 90 in 5 minutes.The HE makes kettling noises. The flames go low for 20 minutes or so. The burner goes off until temp goes back down to...

Can the DV be dismantled from the Actuator and DHW switch ends to replace the spring? I think the DV is still not opening fully due to fact the HE seems to heat up too quickly due to reduced flow.

An update on the above issue. I took off the DV which was easier than I thought it would be. I don't know whether you can dismantle the DV from the Actuator and switch ends to take out the insides so I left it alone. I sprayed some WD40 on the spring that pushed the pins. I cleaned /...

Hi Newgas, I drained it out today but did not add cleaner as most of them say "designed for new systems or less than 6 month old" What do you recommend? Also can someone please answer - would blocked BPV cause this even when there is some circulation. i.e felt flow and return pipes -...

Tried 3 gas safe engineers - They are contractors to a major social Housing Association I work for so are recognized professionals. They said it could be anything because many causes can display same symptoms - Since its an old boiler it would be beyond economical repair. They quoted £1000 to...

First thing I suspected was the pump Checked and was working fine but changed it anyway in case it had lost oomph

I checked pin on DV and it is 9mm on Diaphragm side when at rest As Agile advised. I could not take the pipe off to remove BPV i.e I took the spring clips of and expected the pipe to pull off but it wont budge. I cant get much leverage on it due to it being so close to the wall and I dare not...

Hello Onecog, Yes I have both Installer and service manuals. Can I clean / service the BPV? I have checked the manual and will swap the Temp Probes as they are identical. Diverter Valve - Could I pull the pin back towards rest position to make sure it has fully come back Regards

I know DV pin moves out but was wondering whether it returned fully. When is Diaphragm unit is removed, I did not think I would be able to see the pin as I have very limited access to that side due to wall unit. Onecog suggests faulty by-pass valve and Temp probe Wouldnt the fact that CH...

checked DV - pin coming out a long way Checked DV temp probe - removed connector and burner carried on past 80 degrees - replaced connector burner switched off at 75 PRV not checked yet - what am i looking out for? Want to check DV again,Agile says can be checked from actuator side -...

I never touched those until this problem I have drained it several times and have been careful to turn off / on iso valves The rads heat up (partially) anyway so not that Could it be PCB?

Which valve? I assume you mean isolater valve but which one / where?

I have already check DV - the pin for DHW switch moves in/out ok when set to HW mode only - fires up as soon as demand for water & goes off as soon as tap closed When set to ch/hw mode - fires up as soon as CH timer demands heat =reaches 75 degrees within 30 secs - goes off - comes on as...

shirley thats plate your referring to, aint it?? I mean the HE plate for central heating circuit. Central heating set to FULL demand Boiler fires up and at around 75 degrees, burner shuts down. Boiler does NOT lock out or anything. 2-3 minute pause - temp down to 60 Fires up again for...