JUNKERS ZW / ZS 20 KE - low pressure on the stove, how to add water?

Question

Hello I wanted to turn on the heating today and unfortunately I have a problem. I turned on the JUNKERS gas stove and so: 2 radiators are hot 2 slightly warm and the bathroom is hot at the bottom, cold at the top (I have already vented all of them, the bathroom was the only one that did not...

Magister_123 · Accepted Answer

@ mikimouse12 In the third photo: BIG BLUE KNOB.

W0jtek92 · Answer

Hello, if I am not mistaken, the supply of water to the system is in this case on the left side of the boiler, take a photo of the entire bottom of the boiler.

zyzia3 · Answer

here is a picture of the entire bottom no other valve can be seen here except the red and black one. The manual says unscrew the valve 38, but it is not known where it is:

W0jtek92 · Answer

Hemm. The valve seat is blinded to my eye. It's weird. But maybe you have a valve installed in the installation somewhere?

zyzia3 · Answer

no other valves (except the yellow one next to the stove - but it's probably the gas supply valve) are gone. So what should I call a specialist? Plumber or someone from the stoves? They'll probably tear me off :(

Added after 52 [seconds]:

ps and this red or black valve is definitely not the one I'm looking for?

zyzia3 · Answer

thanks Magister for seeing it. I understand that I have to turn off the stove and turn this valve to the left until the pressure is high. Then turn on the stove and bleed the radiators again?

Magister_123 · Answer

Exactly. When the pressure jumps up to bleed the radiators. Allow water to reach 1.5 bar.
Check that after adding water and restarting the boiler, the pressure on the pressure gauge does not exceed three.

zyzia3 · Answer

unfortunately, when the stove is turned off and the valve is unscrewed, the barometer needle will not even vibrate (the stove does not make any sounds)

Magister_123 · Answer

This is 100% feeding water into the boiler. Maybe you have something clogged up. The barometer also likes to freeze.

zyzia3 · Answer

I succeeded. Thank you very much

zyzia3 · Answer

top-up water, the radiator in the bathroom heats up. The only problem is that it seems to be the last radiator in circulation, it is in the bedroom and it is only lukewarm on the entire surface. Bleeding it didn't do anything. So is there anything else I can do with it? Increase the pressure even more so that hot water can get there (the water that flows out of the vent valve is only slightly warm)? Unscrew something at the radiator?

Magister_123 · Answer

Gently twist the heaters closest to the boiler.

Rafał Cichocki · Answer

Hello, The recommended operating pressure of the device is given in the operating instructions for a given boiler. I recommend contacting one of the authorized Junkers installers. Their search engine can be found at www.junkers.pl. A nationwide service number for the Junkers brand is also available: 801 300 810. The service technician will certainly detect the cause of this defect and help to fix it. I am happy to answer any further questions you may have. Greetings, Rafał Cichocki _______________________________ Junkers consultant

W0jtek92 · Answer

Hello. This is now my question to Mr. Rafał, do you help in the diagnosis and removal of breakdowns on this forum or just give the Junkers hotline number to collect a higher level or points on your account? Because in my opinion, the forum is to ask and get a specific answer, because I doubt that Poles are smart enough not to be able to google junkers service and find the number to the service technician ... So what is it, Mr. Rafale?

zyzia3 · Answer

Right Wojtek, in the case of my second question, I did not need a Junkers service technician, but a neighbor greetings

piracik · Answer

80% of Rafał Cichocki's statements are the same copied text about the hotline.
Often refreshing an old topic just to let us know that there is something like Junkers and how to find it.

THANK YOU! What would we do without this help?

Psycho_Boy · Answer

Hello, can anyone tell me where I am allowed to use water? No pressure, heaters cold

Magister_123 · Answer

I wrote back to PW that you are looking in the wrong place. More photos in the glue pipes under the boiler.

Psycho_Boy · Answer

Is it about these pipes?

Magister_123 · Answer

99% of it is the valve marked in the photo. Of course, there should be a hose with properly fitted couplings.

serwisszulborski.pl · Answer

I would rather ask a local specialist. The boiler has open pipes on the right and left side of the gas for connecting an external hot water tank. Without the container, the pipes can be closed or bridged with a special fitting or connected with a hose. Your Cerastar-2 boiler does not have a factory water supply. The approval should be external, usually somewhere near / under the boiler to monitor the pressure on the pressure gauge during the process. Of course, you can do it with a hose to the manifold (as suggested by a colleague) or install a valve and let gas on the left side ... Another thing, if this boiler has not been used for a long time, will it start at all? Does it require maintenance? The production of this model ended in 1994-95, this wonder is well over 20 years old. Larger repairs are unprofitable.

mikimouse12 · Answer

Hey, my stove pressure is too low too. I tried to locate where the tributary is, unfortunately it was not possible. The stove is Junkers Ceraclass. Thanks in advance for your help

mikimouse12 · Answer

thanks indeed it was it, only that blue handle was frayed on the thread and it wasn't twisting the screw. Made with an hexagon

pixar7 · Answer

Hey, I have this screw sealed, the hex keys, the French can't cope. Is there any other way to release water? Thank you in advance for your help

serwisszulborski.pl · Answer

I do external release of the tap to the heater. There can be many ideas here, you just need a long hose and appropriate plumbing fittings.

pixar7 · Answer

And tell me how long can the furnace run at zero pressure?
A specialist can only be in a week, but I have to heat the washing water every day. Any serious consequences, can I turn it on for e.g. 10 minutes?

zales.vip · Answer

Consequences of working at zero pressure:
Overheating of the exchanger and its faster wear (in extreme cases, its damage - e.g. cracking).
Circulation pump damage (seizure).
Both elements cost about a thousand.

serwisszulborski.pl · Answer

This is where you live that the service technician is coming to you WEEK. In my area, if I don't go on the same day or on the next one, the application has already been lost. COMPETITION will do. A week is frosty in the heating season and it is too long. Go to, for example, OBI, buy a spraying pump for PLN 40, match, for example, a 1/2 half union from a water meter with a gasket (max 10 PLN) with a 3/4 nut, then buy a drain valve, e.g. afriso 1/2 with a thread external 3/4 (PLN 25). You can screw the valve into the radiator and a hand pump with water and pump it up to 1.5 bar on the boiler. The cost of the materials used is about PLN 80 and your time .... Of course, servicing the device is necessary and justified. The customer should not deal with this if he does not have gas and electricity licenses.

JUNKERS ZW / ZS 20 KE - low pressure on the stove, how to add water?

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Post #15

Post #16

Post #17

Post #18

Post #19

Post #20

Post #21

Post #22

Post #23

Post #24

Post #25

Post #26

Post #27

Post #28

Post #29

Post #30

Topic summary