Heater troubleshooting

Jump to latest Follow Reply
sktn77a

sktn77a

Gold Supporter
May 16, 2010
2,642
Chapel Hill, NC
I have a 10 year old Jandy Lite 2 LG millivolt heater. Pilot lights fine. The main burners have been failing to turn on intermittently when I push the ON switch. I followed all the troubleshooting steps and the only odd thing is all the voltages are low. Where it asks "Is voltage 200mv+?", its about 150 mV and where it asks "Is voltage 500mV+" it's about 350-400mV. As the replacement gas valve is $400+ and the replacement temperature control is $200+, I don't particularly want to throw parts at it, especially as I'm not convince either is the problem. What generates the voltage in these heaters? Maybe that's the faulty component?
 
sktn77a said:
What generates the voltage in these heaters?
Click to expand...
w0036901.jpg


Jandy Laars Lite/Lite2 Heater Parts

PoolZoom Pool Parts and Pool Supplies Online. Huge In-Stock Inventory, Quick Shipping
www.poolzoom.com www.poolzoom.com
 
sktn77a said:
I have a 10 year old Jandy Lite 2 LG millivolt heater. Pilot lights fine. The main burners have been failing to turn on intermittently when I push the ON switch. I followed all the troubleshooting steps and the only odd thing is all the voltages are low. Where it asks "Is voltage 200mv+?", its about 150 mV and where it asks "Is voltage 500mV+" it's about 350-400mV. As the replacement gas valve is $400+ and the replacement temperature control is $200+, I don't particularly want to throw parts at it, especially as I'm not convince either is the problem. What generates the voltage in these heaters? Maybe that's the faulty component?
Click to expand...
A millivolt pool heater will not operate with only 350-400mV. It takes that much to run the whole system (typically 400), but with everything running there should be at least a 100mV reading left over. Its that "extra" that keeps the system on. New pilot generator time. Even a new generator will take a bit of time to get a full reading and will seldom ever read the full 750mV they are rated, usually about 700.
 
Yes, I was thinking along those lines based on the troubleshooting I did. Fortunately, I have a thermopile that I bought a couple of years ago after I had the local pool repairman to come out to replace one..... $400!!! Admittedly, he spent over an hour checking the voltages before he diagnosed the issue and replaced the thermopile. The question is how to get at it without disassembling the gas supply to the valve. I'll check out the YouTube videos, above.
 
sktn77a said:
Yes, I was thinking along those lines based on the troubleshooting I did. Fortunately, I have a thermopile that I bought a couple of years ago after I had the local pool repairman to come out to replace one..... $400!!! Admittedly, he spent over an hour checking the voltages before he diagnosed the issue and replaced the thermopile. The question is how to get at it without disassembling the gas supply to the valve. I'll check out the YouTube videos, above.
Click to expand...
Burner tray has to be pulled out to install the generator, sorry.
 
You must log in or register to reply here.
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.
Top Bottom
Back
Jump to latest Follow Reply