ideal Mexico - CH working but not HW

heatservice said:
You said you got a strong jet of water from the toilet radiator when you bled it, try bleeding it with only one of the valves turned on at a time and see if you get the same from both flow & return.
Click to expand...
My toilet radiator seized on the return valves, so only did the flow valves and it sprayed the same.

I fired the boiler up (HW), in about 5mins it dies down.
I feel the flow pipe in the boiler room and the heat goes up almost to the top celling. Checked the airing cupboard no pipe get warm.

5mins late I heard bubbles in the ceiling while I was on the ground floor. Bleed the radiator in the toilet, no air at all. Could this mean airlock?
 
Possibly airlock, but you've a slug of hot water trapped in the pipework, so could be doing anything. Primary pipework should be fitted on a constant rise from the boiler, up to the cylinder, and then the vent pipe going up and over the F&E cistern, allowing all the air to disperse from the primaries as the system fills. So unless someone has altered the pipework and put a dip in it to trap air, then I still think it unlikely and a blockage is your issue.
 
GoodOne said:
My toilet radiator seized on the return valves, so only did the flow valves and it sprayed the same.

I fired the boiler up (HW), in about 5mins it dies down.
I feel the flow pipe in the boiler room and the heat goes up almost to the top celling. Checked the airing cupboard no pipe get warm.

5mins late I heard bubbles in the ceiling while I was on the ground floor. Bleed the radiator in the toilet, no air at all. Could this mean airlock?
Click to expand...
Always a good sign if you get some bubbling noise, turn your boiler thermostat to maximum and just wait the hotter the water is the more it expands and that should help, good luck.
 
Have you tried reverse filling the system with a hose pipe on the drain cock?

Clean out the F&E, reverse fill and clean out the F&E again, add some cleaner and get it circulating around CH then try HW.
 
dilalio said:
Have you tried reverse filling the system with a hose pipe on the drain cock?

Clean out the F&E, reverse fill and clean out the F&E again, add some cleaner and get it circulating around CH then try HW.
Click to expand...
No, i have not. THis would be one of my next options.

Should drain the system before reverse fill?
 
GoodOne said:
Should drain the system before reverse fill?
Click to expand...

Clean the F&E tank first so you don’t pull any more muck down into the pipework.
Once it’s been cleaned, open the drain cock but leave the ball valve filling the F&E for 10 mins or so... this will encourage clean water flushing down through the system and get as much of the dirt in suspension out, as possible.
 
dilalio said:
Clean the F&E tank first so you don’t pull any more muck down into the pipework.
Once it’s been cleaned, open the drain cock but leave the ball valve filling the F&E for 10 mins or so... this will encourage clean water flushing down through the system and get as much of the dirt in suspension out, as possible
Click to expand...
Did this, however still the same boiler fired up for 3mins and dies down.

Next will try to fill it reverse.
 
If it’s just your HW then it’s a blockage/air problem... if the boiler is shutting off on both HW and CH then you are likely to have issues within the boiler.
 
The boiler doesn't shut off on CH & HW (just that HW circuits doesn't get heated). This system is such as, HW will be on as CH is on. CH can't run on its own.

BTW it's good to know that boiler is not the issues.

I read somewhere that someone suggested turning the pump around. Will this create havoc to the boiler/system?

Or should I just rent a power flush? Will this do the job?
 
Last edited:
I pumped air via expansion pipe. Air return in the tank constantly. Does this mean anything? If there is a block I won't get any air return, is that right?

 
After doing so (above video) I turned on (boost) the HW. No result by just pumping air via expansion pipe :(

I looked in the airing cupboard again and realized that the air could happily go through the cylinder and makes its way up to the tank.

So, I blocked the flow from the tank and pumped air via expansion pipe. In this case, hope that it could travel all the way into the circuits.
While I was doing that, I didn't realize that the HW water starts up again. And this time it WORKS! thank god!

And thanks to all of you who really put in your efforts in advising. Really appreciate guys
 
Ooh no. The boiler dies down again but this time I could feel the heat at the expansion pipe. The flow by the cylinder is really hot and on return it colder slightly colder, however, the return by the boiler is cold.
 
Last edited:
You're putting more air into it doing that! Try connecting a hose (from the cold tap) to that pipe instead of the footpump and see what happens. The cistern will fill though so make sure the overflow works and doesn't leak first!
 
I got it going. I felt the return pipe by the boiler is warm. However, the boiler switches off by itself even though I got the control on.
 
GoodOne said:
I got it going. I felt the return pipe by the boiler is warm. However, the boiler switches off by itself even though I got the control on.
Click to expand...
Thats normal with a gravity HW system, your boiler can heat the water faster than the indirect coil can exchange it to your DHW, it may take an hour + before the water in your cylinder is up to temperature, longer if lime scale has built up on the coil over the years.
 
You must log in or register to reply here.
Back
Top