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How to fix low coil temperature in jandy pool heater

Low coil temp reading and D5 error display

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: low pressure reading on Pool Heater

I had this problem with ours last year. I replaced the water pressure switch and it began working fine. We later had a symptom that the blower would start but it would not ignite. The ignitor rod was corroded so I took it out and sanded it with some sandpaper---worked fine...until I dropped it trying to reinstall and it broke. Bought a new one and it works fine now.

Today's problem is related to the blower now.... it is always something, isn't it?!?

Posted on May 30, 2009

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  • 83 Answers

SOURCE: When Heater is turned on display shows 125, doesn't ignite/fire.

I am not sure if you have solved this issue, or not, but here is one idea. When you turn on the heater, it is reading the temp at 125/126 correct? IF this is what the heater is reading, then the problem is the Thermistor,or temp sensor, and is very easy to replace.

If you have an Owner's Manual, there are part numbers and instructions on how to replace the Thermistor. If you do not have one, follow the link below and it will take you to one online:

http://www.pentairpool.com/pdfs/MaxEThermOM.pdf

Posted on Jul 01, 2009

  • 21 Answers

SOURCE: FL 4 error, Jandy Lite 2 pool heater

I believe you may have a draft restriction and this may stop the start up diagnostics. The draft detection switch is sometimes restricted or weak. Common problem. Tap the gas valve to see if the winter has caused the valve to seat heavily and stick.

Posted on Apr 25, 2010

  • 1 Answer

SOURCE: Message 'LOW PRESSURE' on my Jandy LX pool heater.

This isn't a solution, but a question after having the same problem and doing some troubleshooting. I removed the water pressure switch in the heater and turned on the pump and water flows nicely out of the copper tube for the water pressure switch. Next I replaced the pressure switch and removed the two wires and shorted them together, being as a switch is either on or off, shorted or open. I confirmed that the short is seen at the connector going into the control panel. I still have the low pressure light blinking. What now?

Posted on Jul 24, 2010

john224
  • 1378 Answers

SOURCE: Jandy Lite 2 pool heater

Thank you for posting your question here on Fixya.com.


Page 34 and 35 of your manual, found here, describe FL0 as a flow issue most likely caused by dirty filters. Depending on the type of filter you have a good cleaning/backwash will usually remedy that. It is also possible the unit's pressure switch, which senses water flow and therefore reacts to dirty filters when present, may have failed, especially if you winterize the heater in a cold climate and leave water in the switch which can burst the diaphragm inside.

Start with cleaning the filter. If the heater still won't fire jump out the pressure switch while the pump is running to confirm the part is the problem. Assuming it is replacing it with a new pressure switch which should be under $75. The part number can be found in the rear of the manual.


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

Posted on Apr 29, 2011

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1 Answer

Jandy lite 2. How do I correct an fl 5 error?


FL5 is related to input voltage. You state that the voltages check out. Service code FL5, "brown-out condition exists",
will reset after the condition has been resolved.
However, the reset may take up to 3 minutes. The LJ
controller checks the power supply voltage every 3
minutes. If the supply voltage drops below 85% of the
nominal supply voltage, the display will show the FL5
service code and the heater will not start the ignition
sequence. The controller will check the supply voltage
again 3 minutes later. If the low voltage condition still
exists the FL5 service code will remain. If the actual
supply voltage is above 85% of the nominal supply
voltage, the service code will clear automatically from
the display and the heater will resume normal operation.
If the heater was in either 'POOL' or 'SPA' mode
when the brown-out condition was detected, it will
remain in that mode when the condition is resolved.
If
the water temperature is less than the thermostat
setting, the ignition sequence will start automatically
and the heater will operate normally.

Jun 17, 2015 | Jandy Laars Lite 2 Pool Heater 175,000 BTU...

1 Answer

I have a laars jandy 250 lt gas pool heater that only heats luke warm. The heater cycles normally then heats up but stops before reaching operating temp. No service lights and thermal switches are g


I do not have a handy but mine has a temperature setting at the heater and one on the remote. it is possible that one of the settings is low. the pool or spa temp is sensed at the heater and with the water temp located in the pool lines. so both the control board and the heater are sensing the water temperature.

Oct 09, 2014 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

Jandy panel reads 89 degrees, sta rite heater panel reads the right temp 78.


Standard 10K ohm sensor appears to be compromised. Replace it.
You have one for water temp, one for air temp, and one for the solar if you have one.

Feb 14, 2014 | Jandy Pool & Spa

1 Answer

Laars Lite 2 Pool Heater max temperature too low


if hooked to a system increase temp if not try new temp sensor in heater

May 04, 2013 | Jandy Heater Temperature Control Assembly...

1 Answer

Pool heater won't heat water


How big a pool? You normally will not notice a temperature rise immediately. On average, swimming pools will see a one degree rise in temperature every 45 - 90 minutes.

Jan 22, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Laars lx 250 not displaying water temp


check the 2 black wires going int the top of the control board if ok need new temp sensor

Oct 02, 2012 | Jandy Laars Lx 250,000 Btu Heater

1 Answer

Have a 3.5 year old Jandy Aqualink RS 4 --- the air temp is reading correctly (78 F) but the pool temp is reading (201 F). What could this issue be? Pool sensor gone bad? If so, how do I repair or replace...


It is most likely not a bad reading on the on the display.

One culprit of a false temp reading could be:
If the temperature sensor is installed after the heater and the circulation pump is clogged or failing, this would allow super heated water to reach the temperature sensor and give you that reading. However, most pool/spa heaters have a high limit switch that would shut down the heater @ 150 degrees F. So this is also unlikely.

The most reasonable answer is to replace the temperature sensor.

If you refer to page 22 in this manual http://www.jandy-downloads.com/pdfs/Allbutton_manual.pdf
you will see that the temperature sensor is installed on terminals 5 and 6.
Trace these wires. They will goto a thermowell (which holds the temperature sensor) either in the pool plumbing, or to a temperature sensor in the heater itself. Temperature sensors when in the heater are located typically above the inlet/outlet header. There will be some disassembling required to access it in this case.
If it is in the heater and you need more help, e-mail me @ adamh@newconceptchem.com

Please take the time to give me a positive rating on this post if I have helped.

Thanks
adam

Nov 02, 2010 | Jandy Pool & Spa

2 Answers

Heater reads spa water 15 degrees higher than it is


if a 3 wire system put pool at temp desired and spa at 104 if 2 wire to firemans switch run heater all the way up to 104 the system will control the temp

Feb 22, 2010 | Jandy AquaLink RS2/6 All Button Dual...

1 Answer

Low water flow error D5 on Jandy model at550


if filters ok check pressure switch or copper line to it

Apr 11, 2009 | Jandy Air Energy Heat Pump - 100,000 Btus

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