Question about Zodiac Jandy Hi-E2 350K BTU Residential Pool Heater - Natural Gas
The vent switch is for the exhaust. the 135 high limit should be opening if the water temp is getting to 140 degrees.. 1 safety will kill the entire circuit since they are all wired in series
Posted on Feb 13, 2014
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Posted on Jan 02, 2017
Check your heater by-pass valve and be sure it is almost closed. If not that then it will be your internal by-pass. These will force water through heater and keep it from overheating the water inside it and shuting it down. Also check to be sure the baskets are clean and the filter is clean.
Posted on Jun 27, 2010
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Thank you for posting your question here on Fixya.com.
A 'LO' error code for a Hayward heater is a limit string open error. If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes.
The limit string is a series of switches designed to turn off the heater if air or water temperatures exceed a safe operating limit.
The problem may be faulty a switch(es) but is far more likely to be a system condition the switches are reacting too that needs to be corrected. Low flow of combustion air due to obstructions around the heater or the vent; low flow of water through the heater allowing too high a water temp; Poor venting or sooted-over heat exchanger causing flame rollout. These are all conditions that should be eliminated if they exist.
If you are not familiar with these switches or the conditions described you may want to consider calling in a professional. Hayward can refer you to someone in your area who is. Call Hayward at 908-351-5400 or try the website locator found here.
If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!
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