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So when my local expert turns up with his powerflush machine and a litre or two of X800, what is he actually achieving for £300+? Is an aggressive acid-based cleaner normally necessary?

I have no idea what a chelating agent is but does this mean that a "power flush" is my only option? Are there any effective proprietary chemicals that I can purchase over the counter and leave in the system for a while to shift the oxides? The pump seems to be healthy enough and we appear...

Thanks, gents. I will service the 3-way and inspect and clean the by-pass and non-return valves. Water lost from the sealed side when removing parts and captured from the PRV is clean. Obviously some oxide and magnetite solids moving about though and causing mischief. I'll run some X400...

I appear to be suffering a sequence of failures with our Linea 28. In April this year the boiler was repaired and fully serviced by a Vokera engineer. It was blowing off the PRV which turned out to be the common blocked expansion pipe problem. Last week the PRV blowoff problem returned...

Manuals for the Mynute 28SE can be found in the Literature Section, under "discontinued products". It's actually listed as the Mynute 28/96SE and you can download both the user and installation manuals.

You're right, it's located just to the right of the diverter valve (and I wasn't aware of this until now). It does come into effect - but only after the pump has started (to check primary circuit pressure before the gas is ignited). The problem I have is that the pump won't start in the first place.

Thanks for replying. The parts supplier assured me that the replacement PCB was a genuine new PCB sourced from Vokera. However, taking into consideration the fact that the first replacement PCB from this supplier arrived with a rusty transformer, a blown fuse and an obvious board fault that...

You might consider having a bypass valve fitted if there is a possibility that all your TRVs will shut down before the room thermostat reaches its set point. Try setting the TRV in the room where your thermostat is located such that the TRV is still slightly open when the thermostat has...

Our Linea 28 has performed faultlessly for the first 3 years but recently it started playing up. The design is such that if the boiler fails to ignite within 8 - 12 seconds of DHW or CH demand then the boiler will shutdown and go into "lockout". The status LED will turn red and the code "01"...

The Linea 28 will activate every 19 hours to stop the pump and diverter valve sticking. This behaviour is independent of the DHW preheat. See "Installation and Servicing Instructions", page 32.