after turning off the stove, draining the water completely, later pumping out the water, draining the pressure, error f20 appeared. what could be the cause and what can be done about it?

Take a picture and add it to your post. I'm interested in the symbol next to this alarm. Maybe I can help. Added after 8 [minutes]: Once a year it belongs clean the heat exchanger (coil made of carbon deposits) and the thermocouple. And here is the link to the discussion

[/ img] Added after 41 [minutes]: in the manual I found the 'fault reset' button (the flame crossed out symbol). After pressing the stove, the stove started to work, but after unscrewing the water had large temperature fluctuations, sometimes it was warm and sometimes cold. after a longer operation for about 15 minutes, the max temperature appeared 110 and the error f20 appeared again

First, check that the installation is deaerated.

Please provide the boiler number Works with or without a hot water tank?

serial number: 2109410010003322000100518ON5 the only number that is written and the stove works without a hot water tank

Check that all valves are open and the pump turns and does not stuck like it was without water. F20 no water or no circulation the limit temperature is reached. Bleed again.

Vaillant Stove Error F20 After Draining Water and Pressure – What Causes This?

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#1 11369982 02 Oct 2012 17:39

cczc cczc

Level 2

» |

Post #1
11369982 02 Oct 2012 17:39

after turning off the stove, draining the water completely, later pumping out the water, draining the pressure, error f20 appeared. what could be the cause and what can be done about it?
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#2 11370032 02 Oct 2012 18:04

lexium lexium

Level 12

» | Positive voted Helpful post? (+6)

Post #2
11370032 02 Oct 2012 18:04

Take a picture and add it to your post. I'm interested in the symbol next to this alarm. Maybe I can help.

Added after 8 [minutes]:

Once a year it belongs
clean the heat exchanger (coil made of carbon deposits) and the thermocouple.
And here is the link to the discussion
https://www.elektroda.pl/rtvforum/topic1583810.html
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#3 11370355 02 Oct 2012 19:53

cczc cczc

Level 2

» | Topic author Positive voted Helpful post? (+6)

Post #3
11370355 02 Oct 2012 19:53

[/ img]

Added after 41 [minutes]:

in the manual I found the 'fault reset' button (the flame crossed out symbol). After pressing the stove, the stove started to work, but after unscrewing the water had large temperature fluctuations, sometimes it was warm and sometimes cold. after a longer operation for about 15 minutes, the max temperature appeared 110 and the error f20 appeared again
#4 11370675 02 Oct 2012 20:17

lexium lexium

Level 12

» | Positive voted Helpful post? (+7)

Post #4
11370675 02 Oct 2012 20:17

First, check that the installation is deaerated.
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#5 11370691 02 Oct 2012 20:20

cczc cczc

Level 2

» | Topic author Helpful post? (0)

Post #5
11370691 02 Oct 2012 20:20

is deaerated
#6 11370884 02 Oct 2012 20:56

lexium lexium

Level 12

» | Helpful post? (+1)

Post #6
11370884 02 Oct 2012 20:56

Please provide the boiler number Works with or without a hot water tank?
#7 11371098 02 Oct 2012 21:40

cczc cczc

Level 2

» | Topic author Helpful post? (+1)

Post #7
11371098 02 Oct 2012 21:40

serial number: 2109410010003322000100518ON5
the only number that is written
and the stove works without a hot water tank
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#8 11371812 03 Oct 2012 02:02

dziubek102 dziubek102

Heating systems specialist

» | Helpful post? (+5)

Post #8
11371812 03 Oct 2012 02:02

Check that all valves are open and the pump turns and does not stuck like it was without water. F20 no water or no circulation the limit temperature is reached. Bleed again.
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Topic summary

The discussion revolves around a Vaillant stove displaying error F20 after the user drained and pumped out the water. The error indicates issues related to water circulation or temperature limits. Suggestions include checking the installation for air pockets, ensuring all valves are open, and verifying that the pump is operational. The user noted that after pressing the fault reset button, the stove operated briefly but exhibited temperature fluctuations before the error reappeared. The stove operates without a hot water tank, and the serial number provided is 2109410010003322000100518ON5.
Summary generated by the language model.

Vaillant Stove Error F20 After Draining Water and Pressure – What Causes This?

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Topic summary