Not working - strange feeling on plate

Jonnyt
Posts: 4
Joined: 03 Apr 2013, 09:00

Not working - strange feeling on plate

Postby Jonnyt » 03 Apr 2013, 09:06

Hi,

I have been looking at my girlfriends GHD 4.0B straighteners after this weekend they seemed to come on (beep/red LED) but then they seemed to go off (the plates had heated up). I have looked at the most of the resistors and checked the cable and cannot find fault there. The strange thing is (and I don’t know if this happens in normal operation) that when they are turned on (with no LED etc. illuminating) if you touch either plates you can feel the charge on the plates and is a strange feeling when running your finger on either plate, this feeling disappears when the straighteners are turned off. Does this give any clue to where the problem may lie?

gary
Site Admin
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Joined: 26 Jan 2008, 00:44

Re: Not working - strange feeling on plate

Postby gary » 04 Apr 2013, 09:03

Have you checked the thermal fuse and the heater resistances?

The 3.1s use to feel a bit odd if the thermal fuse had failed.

Gary

Jonnyt
Posts: 4
Joined: 03 Apr 2013, 09:00

Re: Not working - strange feeling on plate

Postby Jonnyt » 04 Apr 2013, 12:10

I did check the heater resistance and it looked ok, though i havent checked the thermal fuse yet (it had mentioned that this was unlikely to be the issue on the 4.0B). I just cant figure why it is obvious that there is power going to the plates (due to the tingling sensation you can feel on both when powered) but no LED / buzzer etc and the plates not acutally heating up...........

gary
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Joined: 26 Jan 2008, 00:44

Re: Not working - strange feeling on plate

Postby gary » 04 Apr 2013, 12:49

Do the heaters measure 35ohms when both connected? If you only get 70ohms then that could explain a fuse failure.

I wonder if the thermal fuse fails in such a way that you get a small amount of arching inside? That could explain the sensation.

Gary

Jonnyt
Posts: 4
Joined: 03 Apr 2013, 09:00

Re: Not working - strange feeling on plate

Postby Jonnyt » 04 Apr 2013, 13:02

No it was about 35 ohms (i am aware that if close to 70 it would indicate that one plate is open circuit). I will try and check the fuse later, what reading should i expect accross it?

gary
Site Admin
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Joined: 26 Jan 2008, 00:44

Re: Not working - strange feeling on plate

Postby gary » 04 Apr 2013, 17:39

Close to zero on the thermal fuse. If it has gone you want to check the thermistor is correctly attached to the element on the non switch side.

Gary

gary
Site Admin
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Re: Not working - strange feeling on plate

Postby gary » 05 Apr 2013, 05:16

The thermal fuse should be less than 1 ohm.

Gary

Jonnyt
Posts: 4
Joined: 03 Apr 2013, 09:00

Re: Not working - strange feeling on plate

Postby Jonnyt » 19 Jul 2013, 12:47

Hi,

Just wanted to say thanks for the help on this.

On inspection the thermistor had come away from the plate and the thermal fuse had definitely blown. I couldn’t get any reading from the thermistor so I didn’t run the risk of blowing the fuse again and changed the thermal fuse and bought a new heating plate with thermistor attached.

All working great now, just worth noting that you do get a strange sensation on the plates in this instance.

Thanks

gary
Site Admin
Posts: 1032
Joined: 26 Jan 2008, 00:44

Re: Not working - strange feeling on plate

Postby gary » 20 Jul 2013, 10:41

Excellent - glad you found the problem and we could help out!

Gary


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