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. Then you have to check if the flow of water is sufficient in the heater and to remove the air by unscrewing it.Check if the valves and the jets are ok and if the filter is clean.Received from Monarch regarding err 6.Possible causes are an airlock in the system, lack of flow through the heater (could be caused by dirty filters, closed gate vales, or a faulty circ pump), a faulty sensor or a faulty pcb err 6 : Thermal Cut Out Tripped - This error means that the temperature sensor inside the heater has detected temperatures which could damage the heater as a result the heater will not switch on until until it has cooled to below 38°c and the system has been reset (turn off and on at the mains).err 3 : Stuck Button - Probable cause is faulty topside control.

Coleman saluspa error codes