Pentair minimax 250M CH pressure switch obsolete and replacement switch doesn’t fit

Jmorgan84

New member
Jun 6, 2020
4
Kelowna
We just bought a house and have been having problems with our heater it is very inconsistent. We were told to replace the pressure switch however it is obselete and the new one is not the same size and requires a bushing to connect. We did this and now the heater doesn’t worm at all. Anyone else dealt with this?
first photo is the new switch and the second one is the old one.
 

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ps0303

TFP Expert
In The Industry
Jul 6, 2011
4,049
FL
Does your system have a variable speed pump on it? If so, try running at a higher RPM if you haven't already.
 

JamesR

Gold Supporter
May 18, 2015
128
Nazareth/PA
The little knob under the micro switch is an adjustment for pressure. If you are familiar with a DVM, you can easily check and adjust that switch.