ideal Mexico - CH working but not HW

GoodOne

GoodOne

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Gloucester
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Hiya,

My HW (hot water) not working after I drained my CH (Central Heating).

I released all the air pressure in all radiators.

When I set the control to just HW, I can see the fire start for a couple of minutes and then it went off.

Any idea why?
Should I bleed the myson unit five pump? Is it just unscrew the black nut in the middle?

Here are some picture how my boiler looks like.
20151111_085337.jpg 20151111_090149.jpg
THanks,
 
Last edited:
Looks like you may have inch primaries there, in which case HW will be gravity fed. Could be air locked or blocked pipework, can you tell us how many pipes connect to the boiler please, or put some more pics up of boiler and HW cylinder connections.
 
No water in header tank? Of airlock at cylinder or blocked cold feed.
As looks like gravity hw pumped central heating which is unsuitable for this boiler per manufacturer instructions.

663462BD-8352-4A6E-8BC4-CF375AB5B775.png
 
As said by others you probably have a gravity HW system, if so you will NOT have a thermostat strapped to the side of the HW cylinder and your pump wont run when you select HW only, is that the case?
 
Hugh Jaleak said:
Looks like you may have inch primaries there, in which case HW will be gravity fed. Could be air locked or blocked pipework, can you tell us how many pipes connect to the boiler please, or put some more pics up of boiler and HW cylinder connections.
Click to expand...
I got an illustration of it here.
IMG_20180428_092321.jpg
 
Your picture shows the pump fitted in the HW return, can you check as it should be in the CH.
 
The pump is on the CH. Cant be sure it is on the return or flow.

The HW return is the pipe on the extreme right, I would say.

My money is on an airlock in the primary HW circuit. Can you post a pic if the HW flow into the cylinder?
 
heatservice said:
So have you got a second pump for the CH system?
Click to expand...
Not sure that it's the second pump. Only can find one.

This boiler could only run HW only or CH & HW. It can't run on CH only. And it's a gravy system with a storage cylinder.
 
The pipe on the left of boiler is HW flow the pipe on right hand side with pump is CH flow.
 
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