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When the spa shuts down, the electronics expect the Flow switch to "open" but the circuit board does not get THAT message, so it disables the system to prevent damage. Lucky you, eh! and the problem is "temporarily" resolved until the next time the system shuts down, and the circuit board does not get the message.
Quote from: clover on January 21, 2015, 11:16:35 am When the spa shuts down, the electronics expect the Flow switch to "open" but the circuit board does not get THAT message, so it disables the system to prevent damage. Lucky you, eh! and the problem is "temporarily" resolved until the next time the system shuts down, and the circuit board does not get the message. So what I take from your explanation is that the flow switch is supposed to send some kind of electrical signal back to the motherboard to let it know the switch is flowing water (not sure if that is open or closed). For whatever the reason, this is not happening, either the switch is not sending it or the wires are not carrying it back to the motherboard, or the motherboard jumper connection is perhaps flakey in some way that would cause this electrical signal from the switch to not make it to the motherboard, or the motherboard itself is bad. Am I zeroing in on the right thing here?The door being perhaps causing lack of water flow, if I understand correctly, once the water flows again it should cause the switch to tell the motherboard everything is ok and enable the heater again, right? So I kind of doubt that is the real problem, though it could be what causes the switch to signal the motherboard initially that water flow is stopped, but when the switch tries to signal that water is flowing again, its not getting there. Do I have that about right?Yea I don't see how a power outage could have anything to do with it but they tell me that they have other Sundance owners with similar issues and somehow they have concluded that a power outage while the pump is running could cause the motherboard to get stuck in this state somehow. They said they have tried already quite a lot to figure out about this issue but haven't found a resolution, implying this is a design flaw in sundance spas. I find it hard to believe sundance spas would be that sensitive to a power outage or that the motherboard could so easily get stuck in that state. A wiring or flow switch issue seems far more likely to me for sure.
yea supposedly that is the first thing they replaced before they replaced the circ pump.This afternoon the scheduled filter cycle turned on, even though I was unable to turn on the main jets this morning with FLO message there, but at noon they came on for the filter cycle and heated up the hot tub to 106, which is higher then the max setting. After that filter cycle ended, the FLO message is not there and things seem normal again with circ pump running, which sucks because the guy is going to come look at it tonight and wonder what the problem is.This is very unnerving to have it so inconsistent and I have no way of knowing when the FLO will act up, or I might be out of town.
I am not sure whether they also replaced the FLO switch when they replaced the pump, ............. how I can get this hot tub working properly