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Old 07-22-2016, 11:18 PM   #1
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Short Cycling of Pressure Pump


We have a 45 gallon pressure tank attached to a cistern tank which has started short cycling. We have replaced the pressure switch (40/60) and have set the pressure in the pressure tank to 38 psi but this has not fixed the problem. The tank is holding air pressure, so we don't believe that it's a bladder issue and there is no water shooting from the valve stem when we bleed off air. We have also checked to make sure that the line leading to the pressure switch is not stopped up. We have shut down the power, drained the tank and restarted the tank multiple times but it immediately kicks up to 35 psi and starts the on/off cycling until it gets to the 60 psi shutoff. Help!!!
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Old 07-23-2016, 05:58 AM   #2
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Re: Short Cycling of Pressure Pump


Assuming the tank was properly checked then you have a blockage/restriction between the pump and the tank. The pressure is building before it reaches the tank.
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Old 07-23-2016, 07:17 PM   #3
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Re: Short Cycling of Pressure Pump


Explain how you went about draining the tank. Explain how you went about pressurizing the tank.

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Old 07-24-2016, 10:23 AM   #4
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Re: Short Cycling of Pressure Pump


We turned off the power to the pump and opened a faucet until the pressure dropped to 0. We then turned off the water supply valve to the house. Using a tire gauge, we checked the pressure in the tank and opened the valve to release the extra pressure that was in the tank (40 psi down to 38 psi). Leaving the supply valve to the house turned off, we then turned the power back on to the pump. It immediately shot up to 35 psi and started the on/off cycling.

We have since opened up the joints in the lines checking for blockages and have even run a fish tape through the line to push through any blockages that may be there. With the lines open, we thought we would check to see if the pump was working properly, so we bypassed the switch and wired it straight to the pump. The pump is still going on and off. The only place we haven't checked for a blockage yet is at the pump itself which means completely draining the cistern tank.
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Old 07-24-2016, 03:47 PM   #5
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Re: Short Cycling of Pressure Pump


The pump was going on/off when wired direct to the power line? There is something wrong with the pump.The pump should run continuously when wired direct to the power line. Did you have a water line open so the pumped water could escape?
I suspect an issue with the start switch. The motor comes up to speed and the start switch disengages. Run winding does not engage and keep motor running, do to broken wire or something. Motor slows down and start switch kicks in again. Repeat.

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