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Pressure Switch Sticking

 
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Old 08-08-2011, 09:18 PM   #1
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Pressure Switch Sticking


I went downstairs tonight saw water dripping from my expansion tank. looked at the gauge it was at 98 psi. Made for a real holy chit moment as the pump was still running. Turned breaker off bled pressure off to 20 and turned breaker back on. The switch made the kick off click at 50 psi but the pump was still running. So after a wtf moment i realized the switch opened but the contacts were stuck. Turned breaker off pried them apart with a screwdriver and everything seems fine now. Should i just change the switch out? Never had to deal with a well much....
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Old 08-08-2011, 10:08 PM   #2
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Re: Pressure Switch Sticking


Over time, a gazillion make/break contacts with associated arcing can make the relay contacts get ragged enough to hang up and not pull apart when the coil is de-energized.

A quick & dirty temporary solution is to polish and/or burnish the contacts. If they're not too bad, rubbing them with some low-grade (coarse surface) paper can be enough to take care of it for a bit; worse means actually rubbing with a piece of steel.

But yes, by the sound of it you should replace it ASAP.

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Old 08-08-2011, 10:10 PM   #3
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Re: Pressure Switch Sticking


You can try a little Emery Cloth to dress the points & maybe get lucky.

However...Keep a close eye on the switch and I have a new standing by.
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Old 08-08-2011, 10:12 PM   #4
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Re: Pressure Switch Sticking


Emery cloth will take off what little plating is left. I'd use that only as a last resort.
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Old 08-08-2011, 10:34 PM   #5
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Re: Pressure Switch Sticking


Never used anything but Emery Cloth on points of any kind.
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Old 08-09-2011, 02:21 PM   #6
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Re: Pressure Switch Sticking


just jam a screw driver in there while its still hot wiggle it around and it will fix it till you get a new switch..

Last edited by rex; 08-09-2011 at 03:10 PM.
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Old 08-09-2011, 03:48 PM   #7
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Re: Pressure Switch Sticking


Quote:
Originally Posted by rex View Post
just jam a screw driver in there while its still hot wiggle it around and it will fix it till you get a new switch..
Haha as tempting as that sounds and im hoping your being sarcastic once i got it loosened up last night with the power off it seems to be working for the time being. Electricity doesnt scare me but 220 while im standing in a puddle of water on my basement floor makes me think twice.
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Old 08-09-2011, 04:56 PM   #8
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Re: Pressure Switch Sticking


Quote:
Originally Posted by jkfox624 View Post
Haha as tempting as that sounds and im hoping your being sarcastic once i got it loosened up last night with the power off it seems to be working for the time being. Electricity doesnt scare me but 220 while im standing in a puddle of water on my basement floor makes me think twice.
no i wasnt joking...

either way you have water now
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Old 08-09-2011, 05:09 PM   #9
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Re: Pressure Switch Sticking


Good contacts have less than 30 mV across them at rated current, bad have more than 100 mV.

If pressure switch contact welding is a catastrophic event and depending on the price of pressure switches, put two in series.
If one switch has a 1% [.01] chance of failing over 'mission duration' then the chance of both switches failing over system lifetime is 0.01% [.01^2 = .0001].

Last edited by GettingBy; 08-09-2011 at 05:50 PM.
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Old 08-13-2011, 05:12 PM   #10
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Re: Pressure Switch Sticking


Quote:
Originally Posted by jkfox624 View Post
Electricity doesnt scare me but 220 while im standing in a puddle of water on my basement floor makes me think twice.
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Old 08-18-2011, 04:55 PM   #11
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Re: Pressure Switch Sticking


Change the switch and sleep well
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Old 08-18-2011, 05:15 PM   #12
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Re: Pressure Switch Sticking


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Change the switch and sleep well
And once/year measure the voltage across the closed switch contacts.

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