MCZ Pellet central heating system

[jarnold231]

Good morning,

I'm trying to get an MCZ Hydro-22 pellet stove to provide heating. The stove is operational and is providing hot water to the taps, but it is not supplying the radiators.

Things I have done:

1. Bled radiators
2. Re-pressurised system (all gauges showing 1.5 bar)
3. Set thermostat to 30
4. Checked electricity to pumps (the lights are on in the diode in the switches) and there is heat on both sides of the pumps (Grundfos) - but there are no power lights on the pumps and pressing the button on them doesn't do anything.

I spoke with someone who suggested that the pumps may have gone, or I need to open a valve somewhere in the system. I've tried a number of valves (returning them to their previous positions after a few minutes).

[This system is at my mum's business in the highlands - she's in hospital - and the installer is now out of business and other engineers are hard to come by, so I'm turning to the internet as a final hope before I make an expensive call to an engineer from some distance away]

Any help greatly appreciated, I've put some photos on from the boiler room at the back.

Thanks
Jake

 

[ShaunCorbs]

@missplumb

 

[Welder]

Ok ,then see if there is a manual override to th three way
Unit, you could try setting it to change back and forth, and I would give it a sharp smack with a wrench , it is probably stuck Chking
And give it a dose of wd40 plenty right down he holes by the lever,
Plenty mind you, let it penetrate for an hour or so smack it again,
Then see what happens , let me know Centralheatking

You are kidding right?

I take it you know this guy well and are kidding him along? Well I bl00dy hope you are.

Let's just spray a petroleum based fluid into where a freakin electric motor using brushes sits ! Sorry, but what the hell are you thinking Rob? At the very least, WD40 will start attacking the plastic gears. At worst you start a small fire...

Sorry, but that's just bl00dy irresponsible.

 

[Rob Foster]

You are kidding right?

I take it you know this guy well and are kidding him along? Well I bl00dy hope you are.

Let's just spray a petroleum based fluid into where a freakin electric motor using brushes sits ! Sorry, but what the hell are you thinking Rob? At the very least, WD40 will start attacking the plastic gears. At worst you start a small fire...

Sorry, but that's just bl00dy irresponsible.

The unit is probably stuffed anyway so a squirt will not make things any worse , that’s my opinion and what I would do if it was my gaff....centralheatking

 

[jarnold231]

I didn't end up spraying them - took the covers off and watched them as they switched on/off - both two way valves are working fine by the look of them.

The only thing I cant work out is why the pumps aren't pushing water around. As I said earlier they did light up - but haven't done since. I've been around the place, set the thermostats up/made sure that every switch I can find is set to on - made sure that the return valve on the heating loop is open etc etc.

Completely stumped.

 

[Harvest Fields]

The unit is probably stuffed anyway so a squirt will not make things any worse , that’s my opinion and what I would do if it was my gaff....centralheatking

I would not spray any liquid onto anything that has 240v going to it but that’s my opinion.

 

[ShaunCorbs]

Can you see the micro switches working in them ?

 

[Rob Foster]

I didn't end up spraying them - took the covers off and watched them as they switched on/off - both two way valves are working fine by the look of them.

The only thing I cant work out is why the pumps aren't pushing water around. As I said earlier they did light up - but haven't done since. I've been around the place, set the thermostats up/made sure that every switch I can find is set to on - made sure that the return valve on the heating loop is open etc etc.

Completely stumped.

Ok , we all need to fault find on his one, r u sure the pumps are actually pumping , often when they are bust,seized the impellor head will rotate but no liquid wil be moved , sorry about underlines I do not know how to switch them off

Chk

 

[Rob Foster]

I would not spray any liquid onto anything that has 240v going to it but that’s my opinion.

I would and have done and am living proof , but yes for amatures is probably not a best thing to do..my approach is often radical
But can work

 

[Harvest Fields]

I would and have done and am living proof , but yes for amatures is probably not a best thing to do..my approach is often radical
But can work

Don’t care if your a pro or not. Still shouldn’t spray stuff that you actually cannot see.

 

[Harvest Fields]

I didn't end up spraying them - took the covers off and watched them as they switched on/off - both two way valves are working fine by the look of them.

The only thing I cant work out is why the pumps aren't pushing water around. As I said earlier they did light up - but haven't done since. I've been around the place, set the thermostats up/made sure that every switch I can find is set to on - made sure that the return valve on the heating loop is open etc etc.

Completely stumped.

Is there voltage to the pump? When the valves have motored?

 

[jarnold231]

I cant tell if they're pumping or not. When I press the grey button on the Grundfos pump they dont light up or anything.

Is there any way of telling without a multimeter?

 

[jarnold231]

They feel hot, but cant feel any movement or anything

 

[Harvest Fields]

They feel hot, but cant feel any movement or anything

Probably a pump Issue but without a multimeter you cannot tell. Time to get a plumber in mate.

 

[jarnold231]

They're a fairly elusive bunch around here - soonest I've been given is two weeks.

Probably need to tell them that I want a whole new heating system (which at this point I actually do) and see if that sparks any interest.

 

[Sharp Point]

My take on the problem......

Those grundfos pumps are absolutely Rubbish, they were a quick and late design to get on the modulating pump market. Whip it out !!!!

The leds will be lit, but the actual performance will be far under.

 

[jarnold231]

Those grundfos pumps are absolutely *****, they were a quick and late design to get on the modulating pump market. Whip it out !!!!

Any recommendations?

 

[Sharp Point]

Yes, a new grundfos pump. Those alpha 2’s are a poor pump and haven’t got a great life span