My Hot Tub, Hot Springs Model SQ, keeps shutting off. Under the black panel on hot tub wall, the lights LIM OK (green) and HTR ON (red) shuts off after being on for 2 min. Help!

That would just be the start of what could be wrong with alot of the hot spring models there can be many reason for that to start it could b your control t-stat also the hi limit sensor could cuase that promblem two both of these are a simple fix it also depends on how old the spa is an what style of heater is in it. that brand came out with a new heater almost every year an both of the sensors will be screwed into the outlet side of the heater an they can be replced w/out empting the spa also wath out for hotspring spas frm 2004-2006 cause in 90% of them the heater board traces on the back of the the heaters on n off relay switch are bad an will burn up seem it to the point where its melted the entir control box along w/the circuit board.The most unlikley thing that can cause that problem can some times be the alternate comtrol panel not the main one water can get behind them an short then out an this will make the main board do some strange things such as what is wrong w/yours

It could be two things, first is the flow sensor, if it is bad the tub will shut off as it does not detect water flow and is protecting the pump(s). The other thing is the temp sensor, if it is bad, it senses the tub is to hot and shuts down so to protect the bathers from being burned. Both are are to check without the proper training and tools, find a good hot tub technician, it will run in the hundreds for testing and parts.