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Link please;I can't find it on their website.

Where did you find that info? It's nowhere on Joule's website. Is it the heat-up from cold time (15°C to 60°C) or the reheat time after 70% draw off? If it's 'from cold time' then you would need a 72Kw boiler to do the job and a coil to match! If it's after 70% draw off , it will need a 50kW...

If you have calculated (how?) the required radiator outputs, then you know what output boiler is required: it's the sum of all the radiator outputs! The size/type of radiator will depend on the design temperature of the system. Modern systems are designed to run at lower temperatures so they...

You should be sizing the boiler for the heat loss (and possibly the hot water - see later), not to match the existing radiators. Once that has been done you can compare the required heat for each room with the existing radiator to see if you need to make any changes. It's about seven years since...

The table you show is for a Glow-worm Ultimate 120FF. So far as heating the house is concerned, the important number is the heat output as this is what goes into the water flowing through the rads. Heat input is what you pay for; the difference is due to the efficiency (or lack of it) of the...

The ST699 wiring looks OK. It tells me that you have a mid-position valve controlling CH and HW. However, in addition to the expected link to terminal 5, there is an extra red wire connected to terminal 8 (HW Com). Do you know where it goes? Which boiler do you have (make and eact model)? Do...

This topic is not yours; its five years old! You need to reply to https://www.diynot.com/diy/threads/dt90e-firing-heating-on-when-timer-is-off.545210

how did you identify which were the live and switched live?

The screen failure problem on the CM9XX range affected a particular batch of products. I bought a CM927 in 2007 and it was still working faultlessly when I moved house last June. By contrast, my son's four year old CM907 had a screen failure a few years ago. He sent Honeywell a pic of the screen...

You are assuming that the programmer's HW relay will switch over faster than the CH relay. There may only be a few milliseconds in it, but which ever is slower wins.

That's only true if the last position was heating or hot water. If the valve is in mid position when CH or HW is satisfied, it will automatially change over to the function still required (CH satisfied, changes to HW; and vice-versa).

Have you checked that all the terminals are done up tightly on the back plate? Turn the power off first!

A system with only 4 rads shouldnt need the pump on speed 3. (I had 13 rads at my previous house and the pump ws on speed 1.) Balancing the system correctly made all the difference. A significant factor is the resistance of the boilers heat exchanger as modern boilers have a much hogher...

Grundfos do not list a head-only version of the Alpha 1. I suspect this is because it would not fit the rear casing of the old UPS pumps. You can get a head only version of the UPS2 which will fit your existing US reaar casing. There is a new one for sale on Ebay for £40.

Has he thought about asking one of his Gas Safe friends to help sort the problem out (two heads etc)? It's almost impossible to diagnose this type of problem remotely.

Call the engineer who installed the new boiler and explain your problem to him. He is the first person you should contact.

Overheard in Supermarket toilet roll aisle - devoid of rolls. Ignorant shopper (very loudly): "Does this corovirus thing give you the sh*ts?" Even more ignorant partner (at other end of the aisle): You know it does."

You may have solved one problem; but do you realize that, with a return temperature of 61/62C, the boiler is not condensing, so it's not running as efficiently as it could? It needs to be 55C or less for condensing to occur. What are the set and actual flow temperature? You don't say.

Only an ignorant or incompetent installer would make that mistake.

Most ABVs need to be turned many rotations to make any impression. If you have only turned the knurled collar a couple of rotations you may not see any noticeable difference in the position of the red marker. Count the number of turns so you can reset the valve to its original position. Please...