Jandy LXi Heater - No Blower

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pentagaldad

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Feb 24, 2013
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I could really use some guidance with my Jandy LXi heater. It is 10+ years old and has been fairly reliable. This season it worked, but about 25% of the time it would not ignite on the first try but would eventually light with a couple more tries. Now it won't work at all. When I turn it on (either manually or through Aqualink), the blower never comes on and after a couple minutes the panel displays Ignition Fault. The Fenwal LED never flashes. I have followed the recommended diagnostics in the LXi manual but can't identify the failing component. Seems all the safety circuits are working, but I notice a couple of things that are not as they should be:
  • The white wire to the blower motor is steady at 120V, but the black wire is always 0V. I understand the blower motor should not come on until there is 120V on the black wire and 240V across the white & black wires. Seems to me it is the job of the Fenwal to energize the black wire.
  • The Fenwal LED never flashes. Fenwal manual tells me it should flash initially after 24V is applied to the "W" terminal as it performs startup diagnostics. Well, I never observe 24V on W. To make sure the air flow switch wasn't shorting things, I disconnected the wires on the air flow switch and still never see 24V on W. From this I figure the issue is not the Fenwal, but rather the "Universal Controller Power Interface Board".
Long story short I replaced both the Fenwal and Power Interface Board, but still seeing the same behavior.

Any suggestions?
 
This should be the manual for your heater https://www.royalswimmingpools.com/JandyLXiManual.pdf I am not sure just which board you replaced??? Was it Jandy JXi/LXi Power Distribution PCB Kit | R0458100 or Jandy LXi Controller Power Interface Circuit Board R0458200? Do you have 24V between the "gnd" and "24VAC" terminals on the fenwal? Refer to the wiring diagram on page 24 and parts list on pages 50 & 51.

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pentagaldad said:
I could really use some guidance with my Jandy LXi heater. It is 10+ years old and has been fairly reliable. This season it worked, but about 25% of the time it would not ignite on the first try but would eventually light with a couple more tries. Now it won't work at all. When I turn it on (either manually or through Aqualink), the blower never comes on and after a couple minutes the panel displays Ignition Fault. The Fenwal LED never flashes. I have followed the recommended diagnostics in the LXi manual but can't identify the failing component. Seems all the safety circuits are working, but I notice a couple of things that are not as they should be:
  • The white wire to the blower motor is steady at 120V, but the black wire is always 0V. I understand the blower motor should not come on until there is 120V on the black wire and 240V across the white & black wires. Seems to me it is the job of the Fenwal to energize the black wire.
  • The Fenwal LED never flashes. Fenwal manual tells me it should flash initially after 24V is applied to the "W" terminal as it performs startup diagnostics. Well, I never observe 24V on W. To make sure the air flow switch wasn't shorting things, I disconnected the wires on the air flow switch and still never see 24V on W. From this I figure the issue is not the Fenwal, but rather the "Universal Controller Power Interface Board".
Long story short I replaced both the Fenwal and Power Interface Board, but still seeing the same behavior.

Any suggestions?
Click to expand...
Have you checked transformer output?
 
swamprat69 said:
This should be the manual for your heater https://www.royalswimmingpools.com/JandyLXiManual.pdf I am not sure just which board you replaced??? Was it Jandy JXi/LXi Power Distribution PCB Kit | R0458100 or Jandy LXi Controller Power Interface Circuit Board R0458200? Do you have 24V between the "gnd" and "24VAC" terminals on the fenwal? Refer to the wiring diagram on page 24 and parts list on pages 50 & 51.

​

​

Click to expand...
Swamprat69- Thanks for including the link to the manual. Beginning with section 10.5 I confirmed the voltages up till 10.5.3.6 "Blower Pressure Switch Circuit". There it states "the blower must be operating during the test..." Since my blower won't operate I did not perform the tests suggested in that section nor the following sections.

I misled above on what board I replaced. Page 25 calls out the Power Distribution Board (R04582100). It is the smaller board where the wire harness from the Blower attaches. That is the board I replaced. I also replaced the Fenwal.

I do have 24v between gnd and 24VAC terminals on the Fenwal.

From what I have read from other forums and the Fenwal manual, the Power Interface Circuit Board #R0458200 should energize the "W" terminal on the Fenwal to signal a "request for heat". Since I never see 24V on that terminal during startup I assume the Fenwal never gets the "request for heat" and thus never performs any of it's processes including the initial LED flash. Do you suggest I replace R0458200?

I appreciate any guidance.
 
If you have 24V between gnd and 24VAC on the fenwal, your transformer and power feed are good. If you do not get 24V between gnd and W on the fenwal, it seems that you are losing the 24V somewhere in the safety circuit on the "UNIVERSAL CONTROLLER POWER INTERFACE" board. With one meter lead on gnd on the fenwal, use the other meter lead to check for 24V on the UNIVERSAL CONTROLLER POWER INTERFACE board starting with the "water press" on the lower right and working through low press/fuselink and highpress/hilimit. If you lose the 24V anyplace other than "waterpress" you will need to trace either of the second/third set of safeties individually since both contain more than 1 safety. All this assumes that your interface is actually asking for heat.
 
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pentagaldad said:
Swamprat69- Thanks for including the link to the manual. Beginning with section 10.5 I confirmed the voltages up till 10.5.3.6 "Blower Pressure Switch Circuit". There it states "the blower must be operating during the test..." Since my blower won't operate I did not perform the tests suggested in that section nor the following sections.

I misled above on what board I replaced. Page 25 calls out the Power Distribution Board (R04582100). It is the smaller board where the wire harness from the Blower attaches. That is the board I replaced. I also replaced the Fenwal.

I do have 24v between gnd and 24VAC terminals on the Fenwal.

From what I have read from other forums and the Fenwal manual, the Power Interface Circuit Board #R0458200 should energize the "W" terminal on the Fenwal to signal a "request for heat". Since I never see 24V on that terminal during startup I assume the Fenwal never gets the "request for heat" and thus never performs any of it's processes including the initial LED flash. Do you suggest I replace R0458200?

I appreciate any guidance.
Click to expand...
Did you ever get this fixed? I seem to have the same issue. I called Janet customer support and they told me the blower was before the fenwal, so if the blower never fires it never gets to the fenwal stage. So when I was testing I got no leds on the fenwal on a fault.
 
KetMalice said:
Did you ever get this fixed? I seem to have the same issue. I called Janet customer support and they told me the blower was before the fenwal, so if the blower never fires it never gets to the fenwal stage. So when I was testing I got no leds on the fenwal on a fault.
Click to expand...
The blower is not before the Fenwal. The Fenwal is started by a call for heat with 24 volts between the GND and either W or TH terminals on the fenwal. When there is 24 volts between those terminals on the Fenwal, the fenwal then closes the F1/F2 blower relay contacts to power the blower.
 
pentagaldad said:
I could really use some guidance with my Jandy LXi heater. It is 10+ years old and has been fairly reliable. This season it worked, but about 25% of the time it would not ignite on the first try but would eventually light with a couple more tries. Now it won't work at all. When I turn it on (either manually or through Aqualink), the blower never comes on and after a couple minutes the panel displays Ignition Fault. The Fenwal LED never flashes. I have followed the recommended diagnostics in the LXi manual but can't identify the failing component. Seems all the safety circuits are working, but I notice a couple of things that are not as they should be:
  • The white wire to the blower motor is steady at 120V, but the black wire is always 0V. I understand the blower motor should not come on until there is 120V on the black wire and 240V across the white & black wires. Seems to me it is the job of the Fenwal to energize the black wire.
  • The Fenwal LED never flashes. Fenwal manual tells me it should flash initially after 24V is applied to the "W" terminal as it performs startup diagnostics. Well, I never observe 24V on W. To make sure the air flow switch wasn't shorting things, I disconnected the wires on the air flow switch and still never see 24V on W. From this I figure the issue is not the Fenwal, but rather the "Universal Controller Power Interface Board".
Long story short I replaced both the Fenwal and Power Interface Board, but still seeing the same behavior.

Any suggestions?
Click to expand...
Hello,
I have the same problem as you describe above.
Where you able to find the trouble component?
THank you.
 
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