PhilipB Posted January 9, 2020 Report Share Posted January 9, 2020 At full on or full off the heater control rheostat is cold but at half fan speed it' gets very hot, to the point of beginning to smell. I know that it has to dissipate some energy in order to control the fan speed but I've not noticed it getting as hot as this before, too hot to touch. Is this normal? In fitting some new instrument bulbs, I did knock one of the leads off but there only appears to be possible 2 connections Any ideas? Phil Quote Link to post Share on other sites
RobH Posted January 9, 2020 Report Share Posted January 9, 2020 At fully off there is no current drawn and at fully on there is no resistance in circuit so it will remain cold at these extremes. The rheostat is supposed to get hot in the intermediate settings which is why the body is ceramic but if it is hotter than normal it might be because the fan motor is partially stalled, perhaps because of a dry bearing, making the current draw higher than normal. Is the motor turning freely? Quote Link to post Share on other sites
PhilipB Posted January 9, 2020 Author Report Share Posted January 9, 2020 Thanks Rob The fan motor has always rattled a bit but it turns freely and chucks out quite a lot of heat. Could be the bearing, as you suggest, I will investigate Phil Quote Link to post Share on other sites
DavidBee Posted March 22, 2020 Report Share Posted March 22, 2020 On 1/9/2020 at 2:11 PM, PhilipB said: Thanks Rob The fan motor has always rattled a bit but it turns freely and chucks out quite a lot of heat. Could be the bearing, as you suggest, I will investigate Phil It rattled 30 years ago Quote Link to post Share on other sites
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