electric water boiler switch - Page 1
Forum section: electronics / repair

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: December 15, 2018, 04:45:13 pm
content: Hello.I bought an electric water boiler somee time ago (probably over 2 years ago, so no warranty) and it uses this swtich TM-XD-3 which I think this works based on temperature.The problem is that I bought 2 of these switches on ebay and I'm using one of them but the water boiler keeps shutting off way before the water gets to boiling point but the switch remains at ON position! After a while, the water boiler switches ON again and the water heats up a bit more but still not to the boiling point. Eventually, a bit later the water boiler switches ON again and finally the water reaches the boiling point and after a few seconds the switch goes OFF.So anyone knows how this switch works and why this might be happening and how to fix it?

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: December 15, 2018, 05:04:23 pm
content: Does you're Thermostat looks like this :https://ebay.us/lgiqEyIf you have a multimeter, a heatgun or a hairdryer , a thermometer ( or a additional multimeter with thermocouple sensor) apply heat on the metallic pin of the thermostat and check continuity after it reaches 65 to 70ºC. If it triggers continuity at that temperature or above (100ºC) then it should be good.Be sure that the metallic part is properly connected onto the boiler plate / resistor and / or clean the both to grand proper contact.

author: james_s
author_rank: Super Contributor
timestamp: December 15, 2018, 06:24:12 pm
content: Is there a secondary thermostatic cutout? It sounds to me like that's activating at too low a temperature.

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: December 15, 2018, 09:14:50 pm
content: Quote from: malagas_on_fire on December 15, 2018, 05:04:23 pmOlá malagas_on_fire.The switcc or whatever the name is is exactly the same as I posted in my initial post which also is exactly the same as the link you posted. Or is there any difference between the one I posted to the one you posted?And as far as I understood, this switch is triggered by heat, probably from the water steam that comes inside the switch and that round metallic part is bend in such way that when applied heat to it it will kind of bend the other way, opening the circuit and shutting down the water boiler, is that it?I have a multimeter with temperature sensor (Brymen 869s) so I think I can work with it! I just ned to figure out a way of applying heat without damaging this thermocouple sensor). Maybe I can use my soldering station where I can control temperature, maybe!

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: December 15, 2018, 09:17:26 pm
content: Quote from: james_s on December 15, 2018, 06:24:12 pmI'm not sure it's activating too soon. Or better, it might be that the case but the switch is not "going" to the OFF position! I don't think there is a second cut out system. It was kind of a cheap water boiler. It's a Taurus Selene and cost me about 40€. It's not that cheap here in Portugal but probably 40€ for the most of European countries is a cheap price.

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: December 15, 2018, 09:45:56 pm
content: Quote from: psysc0rpi0n on December 15, 2018, 09:14:50 pmHi there.If is triggered by heat ,then a heat source should change the continuity of the switch. The temperature allows you to monitor at the point that it changes and it should be within the range specified on the link, i belive 65 ~70ºC. Soldering station means that you have hot hair? Apply heat from far point , with narrow airflow to slowly increase the temperature and spot the transition.Thats not cheap kettle indeed.

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: December 15, 2018, 10:58:27 pm
content: Quote from: malagas_on_fire on December 15, 2018, 09:45:56 pmNot hot air. It's a simple Ersa I-Con Pico soldering Station.Sent from my SM-G935F using Tapatalk