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When you say low pressure pump and high-pressure pump...?
Are you referring to low-speed water flow, and high-speed/Jets, waterflow?
do you have a one pump system with a two speed single pump? Or do you have two separate pumps?
Is one pump, which is normal, a two speed pump?
Answers to these questions, will help us, help you!
The H20 sensor is the Pressure Switch. Locate the pressure switch, remove the two leads and jump them together. If the error code goes away, you need a new switch. If not, it could be a software, or other hardware issue.
Verify circulating pump is on and that there are no
water flow restrictions to the heat pump. Make sure all
necessary valves are open or in the proper positions to
allow proper water flow to the heat pump. Verify filter and
skimmers are clean. Check for water level in the pool.
This condition may also appear if the heat pump has
not been operated for an extended period. To clear the
condition, cycle the heat pump, on and off, up to 3 times.
If this does not correct the problem, call for service.
Most filters are rated to 50 psi..although 35 does seem high. make sure that all of your returns are open..could be a valve, or have some other kind of blockage. Although rare, check valves can get stuck closed, so check them, too.. If you have a white one that is solid get rid of it and get one that you can see into..jandy for instance...
Just as a rule I always install a bypass on any heater or heatpump. It will increace the life of the heat exchanger by years.......