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Cal spa sn - Pool & Spa

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SN1 - Hi Limit Sensor Failure
SN3 - Temperature Failure

Posted on Nov 05, 2012


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Posted on Jan 02, 2017


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Have a cal spa and error code OH came up. I shut down the spa for a day and error code is still there and water is no longer hot

Sounds like your high limit has tripped. Most cal spas have a red stem/button on the front of the control box. If you press this in then it will reset and you will be able to heat the spa. You'll have to remove a panel to get to the control box as it is under the spa. It may have tripped because the thermostat is bad and it continued to heat above 104 degrees. We carry a full line of Cal Spa parts at

Nov 03, 2014 | Pool & Spa

1 Answer

Fault code 5n1

I'm assuming this is a Cal Spa? I'm going to reply to this but I'm willing to bet this issue resolved itself?
Error code of Sn1 ("Sensor 1"- Spa is shut down. High-limit sensor is not working.)
This could be a temporary condition. If not, your high limit sensor is bad. "SN" means your spa has a sensor error and "1" means it's the high limit sensor. Without knowing the year of your spa I don't know which manual to give you but the link below has just about every Cal Spa manual available.

Apr 24, 2013 | Fisher and Paykel GWL11 Top Load Washer

1 Answer

Hot tub error code sn

check recirculation pump and heater element

Apr 17, 2012 | Pool & Spa

1 Answer

Plugged in our EZ Spa for first time - panel shows 'SN'

Open your drain for a moment till you get water or force water into the skimmer. If you have an air lock in the pipes this will stop the spa from working.

Jun 25, 2010 | Dream Maker Spas Dream Maker Ez Spa Hot...

3 Answers

I have a dream maker and my heater will not turn on. I had this problem once before when I drained it. However I cannot get the SN error code to go away. Any help would be great

Dream Makers do not have traditonal heaters. You may have an airlock. Look for a plug on top of the pump or some part of the plumbing, loosen to let the air out.

Mar 05, 2010 | Dream Maker Spas Dream Maker Ez Spa Hot...

2 Answers

What does oh mean on hot tub a cal spa

'OH' means 'over-heat'.

Basically the high-limit temperature sensor has detected a temperature far in excess of what it should be.

Check the filter(s), water flow, pump etc....


Jan 26, 2010 | Coleman (5040B750) Patio Heater

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