4620 power lock troubles

ReedA

Member
Having troubles with the power lock releasing on our 4620. Actually it stays on all the time. If the 3/16 return line is unhooked and plugged it will release. Once the line is hooked up it's on again.
Replaced the o-rings in the valve last summer because the valve was leaking. Last fall it started acting up and we just plugged the return line.
My guess is there is something wrong in the valve. Anybody have any advise on where to start? Service manual is pretty vague when it comes to troubleshooting.

Thanks!
 

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