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?
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.
Make sure recirculation pump is working no water flow the switch will not make contact
SOURCE: Spa water drains to pool
Here is a link to the Aqualink website so you can download a trouble shooting guide.
SOURCE: Panel reads "water sensor opened"
I had the same problem. The water sensor is on a pipe running into your pump. It will have a circular clamp around it. Remove the clamp and pull the sensor out of the pipe. The wires should run into your control box. disconnect the wires and replace. My water sensor was part 7790. Not sure if you have the same one. Do an online search. bestbuypoolsupply.com has them for $50 plus 9 for shippng. Hope this helps.
SOURCE: My pool heater will not start. The power light is off and the pressure sw is lit.
You must turn on the pump and let water circulate through the pool and the heater before you turn on the heater otherwise you will ruin the heater
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