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OH, OHH, OHS, OHt, HL, HiLi, Sn2, Sn3, tS, Ht, Blinking Lights The most common valve the tee handle valve (also known as gate or slice valve), will show that the handle is up, but in many cases the gate is still half closed, make sure that it is open all the way, you may need to dismantle the fittings to look inside (once again a big job, last on your list)
HYDRO QUIP SPA ERROR CODES HOW TO
Other issues pertaining to these error codes is debris wrapped around the pump impeller, click here to see how to remove and check (I would do this as a last ditch attempt to solve the problem), or one of the gate valves is not open up all the way.
HYDRO QUIP SPA ERROR CODES CODE
In most cases a replacement pressure / flow switch for this code is worthwhile as even if it does not solve the problem you will have removed the most common fault from your diagnosis and have a highly unpredictable part in stock for the future. When the water is not flowing it should be OPEN, not CLOSED, if it is closed replace it. You can also check the pressure switch or flow switch with a an Ohm meter. Flow switches are plumbed in line with the plumbing. NOTE: Most spas are equipped with pressure switches and can be found threaded into the stainless steel heater manifold.

Pressure switches are in contact with the water, when you remove it water will come out (or should).

This is the last thing you want to happen!!! Always check to be sure that the heater goes off when the pump does! If you are certain flow is present, but your pressure switch isn't activating you may want to remove it and be sure no debris is clogging it up. WARNING, if you go too far the pressure switch may activate with the pump off. Turn the power off before attempting any adjustment! Make all adjustments slowly and try again. Counter clockwise turns decrease pressure required. If not and you know flow is not the issue, most pressure switches have an adjusting collar that will vary the pressure it takes to activate it. With your meter on ohms, check across the poles of the switch. To check for activation: with power off, disconnect the leads going to the pressure switch. Then re-start the hot tub, if the error code goes away, the problem was either a dirty filter (clean or replace) or too many jets were closed off. If however you have the fault then the first thing to do is shut the spa down, do not empty, remove the filter and make sure all the jets are open (as best you can).

Rule number 1 is to always (not with pressurized filter cannister) fill the hot tub after a drain down by placing the hose pipe in the filter housing (remove filter) this fills the hot tub from inside to outside, rather than placing the hose pipe in tub, (this fills outside to inside) and is the primary cause of FLO errors. The fundamental reason is water flow through the spa control system, if the water is not flowing at a rate to satisfy the pressure switch, it will result in one of the error codes above. These error codes are caused by a variety of reasons. These codes are related to flow issues or the pressure switch/flow switch and are by far the most common error codes.
