Question about Hayward H-Series 200k BTU Millivolt Heater - Natural Gas
This is a fault in the control system...prob the high limit switch or pressure valve
Posted on Jun 05, 2010
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Posted on Jan 02, 2017
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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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