Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
When you have a spa with two pumps the first pump is a two speed pump low and high the second pump is one speed high only. If we are talking only about pump one then you should have low speed for circulation and heat and if you press the pump one button it should go to high speed. You stated that in low speed you have no water flow but in high speed you do.
Now some spas have only ONE pressure pump and one circulation tiny pump and this is what I think you mean. It sounds like the circulation pump has either an air lock in it which is an air pocket in the pump housing and you may need to loosen the suction part of that circ pump to bleed any air out. Now it is possible that the motor is turning on but the shaft is not spinning in which case you will need to replace the circ pump.
In most cases you can just loosen the union on the front of the pump, in some cases there is stubbing going to the front of the pump and that tubing is clamped on to the pump just loosen clamp and allow a little water. To leak out for a few seconds then reconnect and turn the breaker back on and let spa boot back up and you should be good.
Did water leak out from the union when you loosened it? If the pump is running and the shaft and impeller are turning and there is no air lock then it has to pull water. Can you take a picture of the pump and the water level in the spa and post it here so I can see.
I see you have two slice valves on the pump. I have seen where these slice valves fail and the internal part of the valve does not open even though you pull up or out on the handle. If the valve on the top part of the pump is closed no water can get out of the pump, also if the suction one is staying closed then no water is getting into the pump. The only way to check this is to drain the spa remove the unions and look inside the plumbing line and be sure that the valve gate inside is completely open or up. I think the suction one may be damaged.