Spa indicator says Water SW Open...what does that mean and how do I fix?
Tried to operate heater for pool which I normally leave at 90 degrees. Water was not that hot so I read display and it read Water SW Open. Switched to SPA mode and no change. What is the fix?
Pool & Spa - Rheem
Answers & Comments
Make sure recirculation pump is working no water flow the switch will not make contact
This means that the pressure switch is not closing. Generally, this is a lack of water flow issue. The main cause is a dirty filter. Clean cartridges, backwash sand, backwash and recharge DE, whatever is needed to clean the filter, this should fix the problem. If not check other sources of restricted flow: filter baskets, pump baskets, shut-off valves. If everything is clear and there is good flow returning to the pool it could be a bad pressure switch. Replace with the correct switch for your heater.