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gaz, r u serious?? i thought that may be a last resort, replace/clean the valves and tubes and stuff (thats what most of the experts reckon on this forum) and then if nothin else fails replace the heat exchanger. crikey this jobs getting more complicated by the minute.

Hi ChrisR, please clarify, dismantle the wax flow restrictor and leave it out?? Do you mean leave it out from testing the circuit or do you mean leave it out all together and remove it from the boiler?? Dave

Sorry, forgot to mention in last post. No i didn't find gauze in the cold water inlet manifold. If there is one, please let me know where it is and i will check it out. Dave

Cheers guys, i thought that about the diverter valve, thanks for clearing that up. I think your right Agile i am going to have to rig a bit of pipe up to test where the flow slows down. The problems with breaking into the wax flow limiter manifold is that water goes all over the electrical...

Hi Agile, I have removed flow restrictor from water inlet manifold, there was nothing to clean as such, every thing looked clear. Turned the cold water inlet valve on and water was running freely, Have not checked the wax flow limiter yet as that is going to take a little more time (weekend job)...

Thanks Gasguru. This is what is happening. 1. Turn on the hot tap, cold water comes out low flow rate, boiler fires up straight away. 2. Water warms up, still low flow rate, boiler still fired. 3. Water gets very hot, low flow rate, boiler stops firing, 4. Water running hot, low flow rate...

thanks gasguru, i will look at these items, but in your experience what about items 110 and 111 DHW flow switch (pressure switch) and micro switch?. From a basic diagnosis point of view, i think that i have got low hot water flow when it used to be ok so something must be faulty and i thought it...

Thanks Chaps, i think i know what i am doing, but just to confirm, where is the automatic flow limiter? where is the manual flow limiter? and where is the flow restrictor? I have ploughed through the part arena pages and there is no reference to these parts, i am guessing they are on the pages...

Hi Agile, thanks 4 reply, i am now a little confused. I agree with you that the boiler does fire up ok but the DHW flow is very low, i dont know what the exact flow was when it was working ok as i never measured it, all i do know is the hot water flow out of the kitchen taps is 4 l/min which is...

Hi Chris, i live in kent which is quite hard (about 300 to 400 ppm) white cliffs of dover and all that, but i haven't noticed a drop of in water pressure, the electric shower upstairs is fine and the cold water taps deliver well in excess of 10 litre per min. Do think this is the problem? or is...

I have got a Potterton Puma 80 permanent pilot light boiler, its about 7 to 8 years old. For the past couple of weeks i have noticed that the flow out of the hot water taps has been very low, so low in fact that the boiler stops firing whilst the hot tap is open, then after about 10 seconds or...