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Just turned cyl stat up and HW running normally. Moved MPV to mid position until sone resistance felt. Boiler running normally

With cyl stat calling for heat and CH on it runs normally. Add HW and hunting starts within a couple of seconds. My purge is closer to 10 secs. To begin the test I turned the cyl stat right down and MPV clicked. Then turned it back up to do as you suggest. The lever moves with light touch to...

Sorry guys, busy day today. Will be back on it in morning.

CH and DHW runs as usual. No apparent issues until I try turning on both together at the clock.. Then hunting starts within a couple of seconds and then continues to cycle off/on with roughly a second between, When switching on boiler, from cold, it seems to purge correctly. Fan running and...

Rodders53, good idea, So I have a plan B. I will try and list the system controls for both the heating and for the back boiler control board. Johntheo5, what constitutes the "hydraulic" side. Does the "power interrupted" maybe point at the boiler or maybe the Honeywell clock ? I think it best...

yes seconds between cycles. It runs normally on either but when I scroll the timeclock selector, and turn on the other, within a couple of seconds the hunting starts. Have not done anything to the system since last winter. Only thing I've done is tried bleeding the oil thinking there might be...

Pump - Grundfos UPS 15-50 130 set on 1, of 3. sited upstairs by cyl. Pumping into return to boiler via control board so solid fuel back boiler preheats system. This control board has not been used for over a year to include solid fuel back boiler in system. Header tank is half full. Cold feed...

Hi Johntheo5, thanks but its not a pressurised system. It is the fact that it runs OK when one or other of the Hot-water or Heating sides are selected, at the clock, that has me foxed. Cyl. stat, and the immersion and its stat appear to be working fine.

Hi All, My Grant Vortex oil boiler is hunting, as in starts and stops, but if I switch my Honeywell clock to either Hot-water or Heating the boiler runs normally. Selecting both results in the boiler hunting. This problem started when the system was used for the first time since previous...

You all obviously get pleasure from helping folk. I find it's often the money thing that gets in the way and halves the pleasure. Then on the other hand it's often the only pleasure to be had from some jobs. If it were possible to help folk without charging AND without getting ya hands dirty AND...

Excellent. :D Full of optimism now. Will be hiring a powerflusher and also doing what you suggest. Sure it will help keep the wife and kids off my case. If it doesn't then I might use the powerflusher on them. Many thanks bab. Have bookmarked this really helpful site.

Makes sense. So I need to install a balance valve. What constitutes a balance valve? Is it simpy a gate valve or something more technically advanced? I presume it should be positioned between diverter and cylinder coil and preferably on the flow.

So my gate valve is being used as a balance valve? If we ignore the gate valve there is not another valve of any sort, apart from diverter, on the flow or return to the cyl. coil. I can see the advantage of restricting the flow during winter = rads get better priority. But not sure why I...

Bab, Please excuse my ignorance but can you confirm that when we're talking about a balance valve we're referring to a by-pass valve. Mine is fitted to the 22mm primary flow to the cyl., 15mm teed off between pump and diverter valve, and goes back to return pipe. It uses a gate valve as...

Hi, I have a problem of boiler kettling and noisy pump = circulation problem. I tried a combined descaler/inhibitor some 2/3 years ago but the problem has returned. Is there a DIY way to power flush the system?

OK, so I should stick with the same size pump. Not sure I understand the balancing suggestion. My bypass consists of a 15mm gatevalve taken off the 22mm flow between the pump and diverter. There's no valve in the flow to coil, apart from diverter, to reduce/control flow. oilman, I can feel...

bab, thanks for the reply. Mines an older system. I used CalChem 3-in-1 about 2/3 years ago but problem has returned. I intend to flush system again but will take advantage of the opportunity and replace pump at the same time. Hence the question re upgrading pump. Can I cause any problems for...

Hengist asked - JohnD offers - My main question relates to changing pump for larger unit and using lower speed to reduce noise. oilman suggests - My thoughts were Hengist might be interested in reply as it obviously relates to the thread.

I've a similar problem. Kettling boiler & noisy pump. If I replace the 15/50 pump with the more powerful 15/60 and use a lower setting will this reduce the noise from the pump whilst sufficient/suitable circulation for my Fuel Saver MKII? I think the system could do with a good flush. Is...