SOURCE: teledyne laars pool heater wont kick on
The safety valve isn't opening .It's very possible that a spider is trapping the opening of the orifice.
SOURCE: pool heater won't kick on
check the gas line pressure; (if this was a homeowner installation you will not be able to check the gas pressure) dirty filters are the number one cause of heater malfunction. before you do anything else break the filter apart and clean completely and recharge with diatomaceous if applicable. also check the pump baskets and make sure there is no debris in the basket or blocking the impeller inside the pump. if this doesn't solve your problem call pentair tehcnical support
SOURCE: How to bypass pressure switch on Lars Lite 2 pool heater?
Jump across the two leads on the switch with a jumper lead (alligator clip leads)
If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c
SOURCE: i have a Lochinvar pool
Hi and welcome to FixYa, I am Kelly. The pressure switch is located in the front header, behind the upper side jacket panel, above the water connections. When required, the pressure switch can be reset with the following procedure: 1. Clean filter and skimmer. 2. Start filter pump. 3. Set digital thermostat to highest setting. 4. Turn the adjustment knob on the pressure switch clockwise until the combustion air fan in the front control panel turns off. Fan will not turn off if system pressure exceeds 5 PSI. 5. Slowly turn the adjustment knob counter-clockwise until the combustion air fan turns on. Turn knob an additional ¼ turn counter-clockwise. 6. Turn filter pump off and on several times. The heater should shut down immediately when the pump stops. 7. If the heater does not shut down immediately as the filter pump stops, repeat steps 4, 5 and 6 until proper operation is achieved.
Try this before taking anything apart to far:
8. Reset thermostat to desired temperature setting.
If after doing all of the above you still have the problem.... you can remove the switch and check for debris in the water passages. If you find debris remove it, reinstall the switch and repeat steps above.
- Still have the problem... Replace the switch.
Thanks for choosing FixYa,
Kelly
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!
John
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