# P20 question **URL:** \ **Category:** Power Components\ **Created:** [June 1, 2018, 3:09pm UTC](https://forum.psaudio.com/t/p20-question/6089 "2018-06-01T15:09:32Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![hiendmmoe](https://avatars.discourse-cdn.com/v4/letter/h/779978/32.png) [@hiendmmoe](https://forum.psaudio.com/u/hiendmmoe)\ **Post date:** [June 1, 2018, 3:09pm UTC](https://forum.psaudio.com/t/p20-question/6089/1 "2018-06-01T15:09:32Z")
I’ve a question involving my P20 screen display I sometimes get a display saying touch the four corners in order 1234. What does this do? And after doing this nothing happens with the display? ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [June 1, 2018, 3:11pm UTC](https://forum.psaudio.com/t/p20-question/6089/2 "2018-06-01T15:11:05Z")
This is for calibrating the display. There is no need to access this procedure unless you are having a problem with the touch screen interface. ---
**Author:** ![Phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@Phil](https://forum.psaudio.com/u/Phil)\ **Post date:** [March 28, 2021, 2:15pm UTC](https://forum.psaudio.com/t/p20-question/6089/5 "2021-03-28T14:15:25Z")
This just happened on my P20 as well, the calibration screen popped up, out of the blue. Has anyone else had that happen ? @jamesh , is this normal or should I be concerned ? ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [March 28, 2021, 2:25pm UTC](https://forum.psaudio.com/t/p20-question/6089/6 "2021-03-28T14:25:10Z")
Unless it starts happening repeatedly I would forget about it. ---
**Author:** ![Phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@Phil](https://forum.psaudio.com/u/Phil)\ **Post date:** [March 28, 2021, 2:32pm UTC](https://forum.psaudio.com/t/p20-question/6089/7 "2021-03-28T14:32:11Z")
Thank you for your quick reply, @Elk ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 3, 2021, 1:07pm UTC](https://forum.psaudio.com/t/p20-question/6089/8 "2021-04-03T13:07:38Z")
Hi all, I have just got a P20. About every 30 minutes I hear a loud click of a relay. Does anyone know if this is normal and why it happens? ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [April 3, 2021, 1:12pm UTC](https://forum.psaudio.com/t/p20-question/6089/9 "2021-04-03T13:12:55Z")
This may be the buck/boost circuitry activating its relay. What is the incoming and outgoing THD? What about the oncoming voltage? Anything out of the ordinary. ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 3, 2021, 1:51pm UTC](https://forum.psaudio.com/t/p20-question/6089/10 "2021-04-03T13:51:03Z")
2.6 in 0.1 out thd 241.5v in which is quite high I guess Only a lightish load as still setting up ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [April 3, 2021, 1:55pm UTC](https://forum.psaudio.com/t/p20-question/6089/11 "2021-04-03T13:55:04Z")
The THD figures indicate everything is OK. I bet it is an output relay. You may find a correlation between the incoming voltage and the relay click. ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 3, 2021, 2:05pm UTC](https://forum.psaudio.com/t/p20-question/6089/12 "2021-04-03T14:05:23Z")
Maybe once it’s loaded more, more current drain, relay will stop switching ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [April 3, 2021, 2:08pm UTC](https://forum.psaudio.com/t/p20-question/6089/13 "2021-04-03T14:08:18Z")
I do not expect this to make a difference, but perhaps. We need @jamesh to drop by. ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 3, 2021, 2:15pm UTC](https://forum.psaudio.com/t/p20-question/6089/14 "2021-04-03T14:15:42Z")
Thanks Elk ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [April 3, 2021, 3:13pm UTC](https://forum.psaudio.com/t/p20-question/6089/15 "2021-04-03T15:13:36Z")
I agree with Elk, the amount of load won’t have an impact on this. It’s simply a factor of incoming voltage. Completely normal. ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 3, 2021, 3:14pm UTC](https://forum.psaudio.com/t/p20-question/6089/16 "2021-04-03T15:14:35Z")
Because the Vin is so high? ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [April 3, 2021, 3:18pm UTC](https://forum.psaudio.com/t/p20-question/6089/17 "2021-04-03T15:18:53Z")
Yes, and it also happens when the voltage in is lower than desired out. ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 3, 2021, 3:19pm UTC](https://forum.psaudio.com/t/p20-question/6089/18 "2021-04-03T15:19:45Z")
Thanks James ---
**Author:** ![chris5](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@chris5](https://forum.psaudio.com/u/chris5)\ **Post date:** [April 4, 2021, 4:22pm UTC](https://forum.psaudio.com/t/p20-question/6089/19 "2021-04-04T16:22:57Z")
Hi @jamesh, would increasing Vout closer to Vin reduce the frequency of the relay switching? I’m also a bit concerned the relay may fail over time if it is switching over 50 times a day every day. ---
**Author:** ![Phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@Phil](https://forum.psaudio.com/u/Phil)\ **Post date:** [April 4, 2021, 4:29pm UTC](https://forum.psaudio.com/t/p20-question/6089/20 "2021-04-04T16:29:59Z")
Hi Chris, I am in Belgium and my Vin is regularly around 240V instead of 230V, but I have no relay clicks. ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [April 4, 2021, 7:08pm UTC](https://forum.psaudio.com/t/p20-question/6089/21 "2021-04-04T19:08:32Z")
This does seem like a lot of switching. ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [April 5, 2021, 4:57pm UTC](https://forum.psaudio.com/t/p20-question/6089/22 "2021-04-05T16:57:55Z")
50 times a day? That’s a lot more than I’d expect! Does it sound similar to the relay when the unit is taken out of standby? [Next page](https://forum.psaudio.com/t/p20-question/6089.md?page=2)