dpmiller

From the *full* manual (there are a couple of versions I found) "Note: Sentinel Kinetic Plus units have spigots suitable for either diameter 150mm ducting (UK model) or for diameter 180mm ducting (rest of EU model). The diameter 180mm spigots come complete with self adhesive foam adaptors to enable it to be used with either diameter 180mm ducting or diameter 200mm ducting. These foam adaptors are to be fixed to the outside of the spigot for diameter 200mm ducting. High Flow units are supplied with 180mm spigots, an accessory pack of four self adhesive foam adaptors part no. 409761 is available for use with 200mm ducting.

please explain how pipe size affects pressure? Unless of course you mean dynamic pressure, the reduced pressure caused by a restriction to flow?

Capacitors slowly lose value with time and if the starting cap is low the motor will ramp up to speed more slowly whilst taking an excess of current, whereas the correct value will jolt the motor up to full speed (often using even more current !) so quickly that the overload trip doesn't have time to respond eg whilst a 3Hp piston compressor will run off a 13A plug (running current between 11 and 14A generally) the starting current is somewhere around 40A for a second or two in my experience. If the capacitor has lost a bit of capacity- 20% say- it could be drawing 30A for five or more seconds... Do you have a multimeter that has a capacitance range or an AC clamp meter? If not, just spend a tenner on a new capacitor...

Is the oil fresh, and might you try replacing the start/ run capacitors?

B&Q stock 89mm CLS but pricing's unlikely to be competitive I'd guess. None of the local usual suspects carry CLS...

Not a simple oil boiler then as there's no link between burner and system other than the 'stat. Now a Combi is a different bucket of kippers...

how?

telling ya, welded contacts. Mine- now piped to the TS and both manifolds- was happily pulsing 40-55c yesterday. On test with no flow in the circuit, pumps off, valves closed; no overshoot.

Filter is a definite possibility then if it runs for a period of time- minutes or more- before locking out. The pump will happily suck the contents of the pipe until it reaches a vacuum it can't exceed. After lockout fuel seeps through the blocked filter and you get another pipeful to play with...

Good point, I missed that. Definitely a dodgy stat. Before condemning it completely I'd probably pull it out and pop the cover off to check for welded contacts or (more satisfyingly) whack the terminal box end off something hard and refit/re-try...

Is it a one- or two- pipe system? (from the oil tank...)

Yep. While an annual change is profit for the pros, every couple of years *does* make a difference. Any access to a pressure gauge and combustion analyser?

Just for a sligtly different view... Over here where the Willis is used as intended (soft but dirty water, convective flow only) they kettle away happily for decades, bouncing off the control stat any time they want to.

so how old *is* the jet?

... but that should happen within 30secs of ignition really.

how long does it run before lockout?

Don't randomly check, observe. Does the motor start can you hear the ignitor crackle? Is there a click from the solenoid valve? And because it's a Riello, does it have a hydraulic flap, and is it opening? And... because it's happened twice to my dad's now... is there a possibility a mouse has crawled inside and is stalling the fan?

Other than the Salus auto-balancing actuators Clive, they tend to be wax-expansion rather than solenoid. Bit like a TRV body with a heating element integrated. As the actuators only take a few Watts it's no problem paralleling them, or instead you can link the inputs in the wiring box. And you'll probably need one of those, to get pump and boiler switching, delay tiing etc...

Our dry ridge is pretty much invisible. The edge of the roll-out is just about flush with the ridge, and the clay ridges interlock with the retaining Tekscrew sittng into a recess in the ridge. Uni-ridge here: https://www.lbsproducts.com/roofing-accessories/ridge-tiles/clay-ridge-tiles

ours are all 89mm CLS. One consideration might be the door linings you're thinking of, standard or bespoke?

yep

Not a UVC but I did buy a TS off them a few months back. Great folks to deal with, fully bespoke, easy to pay.

All our walls sit on a course of quinnlites.

the blower is darned-silent on our Solido, to the extent that I occasionally put my hand over the air inlet pipe to check it's drawing air. Blower sits inside a sealed box, in the middle of the manhole. Now when it's doing it's occasional (twice a day IIRC) pumpout there's a very obvious-from ten-feet-away pouring gurgling water noise. But that's only for a few minutes and you'd have try try, to catch it...

plantar fasciitis? Have you changed to a heavier quilt recently? Spent lots of time on your knees?