Heater/Goldline Aqualogic and more

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Gingermom

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Sep 16, 2017
42
Houston, TX
Pool was built in 2008. For the most part everything works fine. last replace the handheld remote June 2023. Hit Spa party last night and nothing happened. Usually the pool will switch to spa, the lights will come on and the heater will kick on. If I hit spa spearately the spa will come one, same with the lights ( although the mail pool light flashing green or is off - a Hayward colorlogic), but the heater is not turning on. It's an Hayward H400FDN. The screen shows "ho" I can not find any reference in any of the Hayward trouble shooting guides as to what this might mean. I found one online reference that it indicated water temp was too high, but the sensor seems to be correct with a reading of 72 ( we have replaced that in the past). I have attached a screen shot. So I am looking for help on where to start with the heater as well as any thoughts as to why the spa party grouping may have quit working on the remote. - or if the heater not coming on could impact that. We have self dealt with an IO code a few years ago, but pretty much everything else has been problem free. I am assuming the flashing light means the pool light is mal-functioning and would need to be replaced, but don't really care about it at the moment. Any insight would be appreciated.heater code.jpeg
 
I suspect your heater may be showing a bO code and the lower LED segment is burnt out.

bO indicates the heater is in bypass and under the control of the Aqualogic.

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Do you have a multimeter and know how to use it?

Show us pictures of your equipment pad and your Aqualogic board.

The Spa Party button on your remote may be worn out.

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I guess it is possible, but if it was in standby mode controlled by the spa, then shouldn't it turn on when I turn on the spa? I still have my old remote and if I leave it plugged in the charger it still works. Spa party doesn't work on it either. Since the remote I am using is new and touch screen, I don't think it is a button issue. When I press the spa button ( as opposed to spa party) the pool switches to spa mode and it indicates the heater should be on and controlled by temp. During the freezes we had a couple of months ago the pool went into freeze prevention mode and the pump cycled between pool and spa only. I noticed when the pump is off the heater says IO. I don't remember if that is normal. I wasn't sure what you were looking for in terms of the panel, so I also sent a picture of the operator's manual incase you were looking for model.
 

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Gingermom said:
I noticed when the pump is off the heater says IO. I don't remember if that is normal.
Click to expand...
Again, I think your lower LED segment is inoperative.

LO is the code for the water pressure switch being open since the pump is not running. Without the lower segment, that would show as IO.

Your Aqualogic should not be trying to run the heater while the pump is off.
 
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Gingermom said:
I guess it is possible, but if it was in standby mode controlled by the spa, then shouldn't it turn on when I turn on the spa? I still have my old remote and if I leave it plugged in the charger it still works. Spa party doesn't work on it either. Since the remote I am using is new and touch screen, I don't think it is a button issue. When I press the spa button ( as opposed to spa party) the pool switches to spa mode and it indicates the heater should be on and controlled by temp. During the freezes we had a couple of months ago the pool went into freeze prevention mode and the pump cycled between pool and spa only. I noticed when the pump is off the heater says IO. I don't remember if that is normal. I wasn't sure what you were looking for in terms of the panel, so I also sent a picture of the operator's manual incase you were looking for model.
Click to expand...
When you turn on the spa and if the system indicates the heater is "on," that only means that the automation has "flipped the switch" that allows the ignition circuit to close, power flow, the rest of the heater's system takes over.

You need to determine if the automation is saying its on but the circuit is not complete, like flipping a light switch to "on" but the light doesn't light. Is the bulb bad? Is the lamp unplugged? Is the switch on the lamp "on?"

With the pool running, what is the temperature reading at the AquaLogic? Is it correct? Do you get a reading? If not correct (very high or above the set temperature when the water is cold) or no reading, the water temp sensor is bad, or has a broken wire, has rodent damage to the wire (they love the taste), disconnected inside the AquaLogic, and the heater won't light

The automation can "turn the heater on" (close the ignition circuit) but the pressure switch will be "open" if the pump isn't running, in automatic it should not be able to. You may get an IO because of that, though it should be LO if the display is working correctly.

The picture should definitely be "bO" indicating automation is active. Press and hold the up and down arrow for about 5 seconds and it should revert to complete heater control. Turn the pump on (be sure to have a relatevely clean filter), be sure it is set to 104 on either pool or spa, and see if the heater will light. If it does the problem in in the AquaLogic.
 
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The temperature is usually correct, but it does sometimes show weird temperatures and that is an easy replace. I cleaned the filters this evening so will test the heater. If the it turns out it's not the Aqualogic how do I hook the heater back to be controled by the Aqualogic rather than manual? I had read about holding the arrow for 5 sec to revert the control, but how do you set it back?
 
Gingermom said:
I had read about holding the arrow for 5 sec to revert the control, but how do you set it back?
Click to expand...
A bO code is a normal display on the heater when it is controlled by automation. It indicates that the heater is in remote control mode.

To put your heater in bypass you:

  1. Press the Mode button to place the heater in Standby Mode
  2. Hold the Down Arrow and Mode buttons simultaneously for 3 seconds for Bypass operation. “bO” will be displayed on the screen
  3. Heater must then be in the Spa or Pool Mode for operation. The heater will fire when instructed by the external control.
To remove your heater from bypass mode, you:

  1. Press and hold the DOWN key and
  2. Then press and hold the MODE key
  3. Hold down both keys for 3 seconds until the indication ‘‘bO’’ is removed from the display.
 
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What the "IO" code means:
The "IO" code signifies that the heater's control system has detected a problem with the ignitor circuit, specifically that the circuit is open.
Troubleshooting steps:
Inspect the ignitor wiring: Check for any damage, loose connections, or poor grounding in the wiring harness connected to the igniter.
Verify igniter resistance: Use a multimeter to measure the resistance of the igniter itself. If the resistance is outside of the acceptable range, the igniter needs to be replaced.
Replace the igniter: If the igniter is faulty or the wiring is damaged, replace the igniter with a new one.
 
What should be checked if the 'LO' code is displayed?

Verify adequate water flow and inspect the water pressure switch wiring.

Check the continuity of the water pressure switch.

If the switch is open, replace it.

Inspect and test the high limits and vent pressure switch.

LO is Limit Open. Limits are Water pressure switch, vent pressure switch and temp limit switch.
__________________________________________________________________________________________________________
What should be done if the 'IO' or 'SB' code appears?

The 'IO' code indicates an ignitor circuit open.

Inspect the ignitor wiring and verify the ignitor ohm resistance.

If the resistance is out of range, replace the ignitor.

The 'SB' code indicates a stuck button, which may require replacing the display/bezel/keypad.

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UH Series Heater FAQ | Hayward Pool Products

Explore answers to common questions about troubleshooting, maintenance, and operation of Hayward UH Series heaters products
hayward.com hayward.com

What should be done if the 'IO' or 'SB' code appears?

Discover the steps to address and resolve issues when the ‘IO’ or ‘SB’ code appears.
ca.hayward.com ca.hayward.com
 

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Igniter open error: If the control is not in lockout and senses that the igniter circuit is open when the blower is running the control will turn off the blower and go into lockout.

Automatic restart 2 min after error is corrected.

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FDXLIGN1930 IGNITOR

 

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Heaters made prior to 07/16 that want the new display/bezel/keypad, will need to replace the old display with the Kit-Bezel Control Panel specific to their model heater.

Old style FDXLBKP1930 Bezel & Keypad Assembly

IDXL2DB1930 IDXL2DB1930 Prior 07/16-Display Board (only)

*FDXLBKP1932 Display/Bezel/Keypad Assy.

FDXLBCP1400. New Kit-Bezel Control Panel, 400.

To remove/replace the display board or keypad:
1. Turn pump, gas supply, and heater power OFF.
2. Remove the front access panel.
3. Unplug the display board ribbon cable from the ignition control board.
4. Remove the 4 screws and remove the plastic bezel & keypad assembly from the sheet metal panel
on the front of the heater.
5. The display board is attached to the back side of the bezel & keypad assembly. Unplug the keypad
ribbon cable from the display board.
6. Detach the board from the plastic bezel by removing the 2 small screws.
7. Replace the display board or bezel & keypad assembly, and reverse the above steps to reassemble.



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Last edited:

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  • uhs-heater-troubleshooting-guide.pdf
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JamesW said:

View attachment 634236

Igniter open error: If the control is not in lockout and senses that the igniter circuit is open when the blower is running the control will turn off the blower and go into lockout.

Automatic restart 2 min after error is corrected.

View attachment 634239



FDXLIGN1930 IGNITOR

Click to expand...
This is very helpful. hitting the mode key in connection with the down arrow does not change the display. It remains the hO ( bO assuming the bottom light is out) and the service light is NOT on. The display only changes if I turn the filter off and then it changes to the IO ( which could be LO if the bottom LED isn't lit) in which case it is supposed to read that. The pool temp appears to be correct. So, this may be above my pay grade to figure out. Anything else I should check before I call someone?
 
Gingermom said:
hitting the mode key in connection with the down arrow does not change the display. It remains the hO ( bO assuming the bottom light is out) and the service light is NOT on.
Click to expand...
bo is normal display when heater is being controlled by a remote thermostat.

No service is required.

If heater is not being controlled by remote thermostat, change setting by using the MODE key to put the heater into STANDBY.

Press and hold the DOWN key and then press and hold the MODE key.

Hold down both keys for 3 seconds until the indication ‘‘bO’’ is removed from the display.

If the display will not change, then the keypad is probably bad.
 
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