GHD SS4 repair 

yes thermistor is faulty as you have suspected.

@@KevsElectricalWorkshop Thats great thanks for the reply. I didnt want to end up spending money on parts without being sure.

Faulty ones on ebay is your only hope

the heaters are 70 ohm on this model

what resistors are blown?

Did a n00b thing tested at 200k :D..When it should have been at 1m ohms im just trying to learn love the videos, Is there any way to test the pic with a multimeter love your ideas thank you for the help, i have already replaced one heater plate,, thermal fuse is fine just testing the diode look fine, strange because i must have not had any heater issues in the first place. I'm going to check further tomorrow, i need to check the pic really there Ghd ss 5.0 Will check more tomorrow hopefully can diagnose the issue, they beep and the light flashes about 4 time or more then the light goes completely out but the heaters do not heat, All resistors are within spec of 51 ohms and the 1M ohm ones seem high enough,Checking diode again and the capacitor, Feel like the pic chip has gone is the pic compatible with the 4.2b pic ?Both have round buzzers. Had to use a 3950 bulb type thermistor but that looks fine as i replaced it with a new one..Used the exact same method i did on the last ones.Thank you for your time mate

Ok a fader as i call them, start then fade to nothing. Switch on and let it die then unpug (very important) and test thermal fuse resistance (they can fool you when there breaking down), if not that then most possibly C1. I need to do some more videos just need to find the time.

@@KevsElectricalWorkshop please do more videos you've been mia for almost a year.

I Know life has got a bit in the way at moment i am planing one or 2, anything you would like to see

Proberly R8/R11 or thermal fuse

Kevs Electrical Workshop thank you, now i check it 😊

Excuse me again. R11: 51,2 R8: 51,4 Thermal fuse: 0,3 Both resistor: 34,5. I think all is good. Just see something like fire on the fuse's screw. What can i do to repair this? Excuse me for the bad english. If u can help me please 😬

verify diodes D2 & D9, if good then PIC hads gone, if PIC gone proberly means switch needs to be dismantaled and cleaned. if fuse screw has flashed over (very rare) then PIC will have gone. the PICs go do to dirty switch arcing or a flashover.

Kevs Electrical Workshop thank you for the reply, but what you mean as "PIC"? Should be U2?