bigdog100 Posted December 24, 2013 Report Share Posted December 24, 2013 Hi, I tried to fire pool heater and get this message HI LIM SW. I pulled cover off and I see schematic with switch reset but cannot find actual switch. Any ideas? Quote Link to comment Share on other sites More sharing options...
bigdog100 Posted December 26, 2013 Author Report Share Posted December 26, 2013 Anyone?? Quote Link to comment Share on other sites More sharing options...
brettnolan Posted December 28, 2013 Report Share Posted December 28, 2013 You are likely going to have to have a service call. Generally a Hi Limit problem is due to a flow problem through the heater rather than a problem with the switch. I'm not familiar with the Jandy heater, but most heater have a thermal regulator threaded into the heater manifold and it works similar to a thermostat in a car. Depending on the type of regulator, it could be simply that the spring (if so equipped)is not working (because it's been chemically damaged, debris stuck in it, etc), the regulator itself could be bad...trying to think of other possibilities. In any case, probably not something you want to tackle yourself if you are not particularly mechanically inclined. Quote Link to comment Share on other sites More sharing options...
hey_poolboy Posted January 14, 2014 Report Share Posted January 14, 2014 High limits on that heater are located directly under where the plumbing goes in and out. There will be two silver cover plates over with philips screws that hold the hi-lims in place. Each will have two white wires. Remove them and do a visual inspection. With polymer headers there will be a brass bolt/nut that transfers the heat from the water to the face of the limit switch. If the limits are corroded at all check to make sure that those brass bolts aren't leaking into the limit area. IIRC the bolts are still available, and the limits are certainly available. Keep in mind, if the limits look fine, you can still check them for continuity with a meter. It is also possible that the wire has been broken. If the limits have actually had to perform their intended job they also have a life span. Jandy usually says about 10-12 cycles. Quote Link to comment Share on other sites More sharing options...
Bugman1400 Posted January 14, 2014 Report Share Posted January 14, 2014 The terminal on mine corroded off and I had to replace the switch and the wiring. Quote Link to comment Share on other sites More sharing options...
Hughescorp Posted February 1, 2014 Report Share Posted February 1, 2014 My thermo reg was badly corroded, simple change out. $40 or so on amazon. Fired right up. Check out POOL CLOWN responses to heater issues. Pretty insightful. Quote Link to comment Share on other sites More sharing options...
Pool Clown Posted February 12, 2014 Report Share Posted February 12, 2014 If you are getting that code without the heater having fired, it is more than likely the wires from the hi limit have been chewed or otherwise disconnected. OR the high limit itself failed (unlikely, yet not impossible). Quote Link to comment Share on other sites More sharing options...
Gschiavo Posted July 30, 2015 Report Share Posted July 30, 2015 Hi Pool Clown, where would I find these Hi Limit wires? I have the same issue... can you please direct me as to where the wires are located so that I can take a look at them?? Thank you!! Quote Link to comment Share on other sites More sharing options...
Bugman1400 Posted August 12, 2015 Report Share Posted August 12, 2015 The sensors are in the inlet/outlet housing underneath the 2 inch pipes. They are typically covered by a small stainless steel plate. You will see the white wires for them leave the housing and go into the heater cabinet. It is explained above. There is also another safety switch down by the burner assemble that looks like a resistor. It is supposed to detect if you have a flame roll-out but, sometimes this switch goes bad and becomes an open circuit. Most of these safety switches can be bypassed with a set of alligator jumpers as a method of diagnosis only. Do not leave any of the safety switches bypassed for obvious reasons! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.