Question about Jandy Laars Lt 400,000 Btu Heater

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Spa will not heat more than 85 degrees or so

I just replace the heater circuit board and my spa will not heat up as it should. Cicuit Board tempature is frozen at 84 degrees. All other gauges work.

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On the back of the board is the bottom for seting the max temp follow the intruction from the manual or get one at

Posted on Sep 01, 2009


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1 Answer

Just had our circuit board on H400FD Haywood pool heater replaced. Heater did fire up but wouldn't go past 65 degrees and went to standby.

It may be wired incorrectly, there are 3 terminals for the Hayward heater that connect it to automation.

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If they are not wired correctly this issue can happen.

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make sure spa setting is at 104 degrees if at 104 degrees see control system if ok change temp sensor either in heater or control unit

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Dream maker 400x spa. Overheating and won't turn off

high limits on spas are usually set for anything over 108 degrees. take a thermometerand compare actual water temp inside tub to what is on display panel. water sensor may be shot therefor not turning the heat element off. relays inside circuit board may also not be workin, if so replace circuit board

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Sundance 605 Series spa. Recently had the motor replaced, but now the motor runs continually. Installer said I need a new board. Is there anything else that could cause this?

When a spa runs continually it can be a bad board but we would have you replace the Temp Sensor first. If the spa is not heating it could be the pressure switch is not working or it could be the Temp Sensor or the High Limit sensor.
Check the topside panel to see if the heat indicator light is on. If it is NOT on then your pressure switch needs to be changed.
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US Parts Center

Mar 31, 2013 | Pool & Spa

1 Answer

Spa Heater

You need to check your temp sensor and your high limit. Both are tubes that slide into the plumbing on or near your heater. If this is a tube heater then they are probally at on each end of the heater and will have small wires coming from them that go back to the control board. Farely common problem and easy enough to fix with replaceing them both. A number of models wire them together so they come as one part. Good luck.

Jan 18, 2010 | Dream Maker Spas Dream Maker Ez Spa Hot...

1 Answer

Panel reads HHO-----, no temperature display until activate jets, then shows a temperature drop sometimes down to 65 degrees ,then starts heating upwith jets going

"OH" is an overheat error. In normal function, it is used as a safety shut off if the spa water temperature reaches over 110 degrees in the event of a thermostat failure. But more commonly, (if the water temp hasn't gotten too hot) it indicates that the temp sensor(s) have failed. If you have a digital display on the topside controller of your spa, then it is a circuit board controlled spa pack. Most spa builders use the same control pack manufacturer - Balboa Watergroup. The sensor kit usually consists of 2 probes and wires that plug directly onto the circuit board. Depending on the spa, they could both be located onto the heater manifold, or one on the manifold and one mounted to the tub making direct contact with the water via a thru-wall sensor mount. If I knew the spa manufacturer, I could further assist you. If you replace the sensors, and encounter the same problem... then the circuit board is bad, and usually a costly replacement. The sensors are usually listed as a "BA sensor assy" Hope this helps you,

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I have a Sundance Spa (Altmar - bought in 2004). I've never had a problem before. I just changed out the water and noticed that its not heating as anywhere near as quickly as before. I do not see the icon...

we spoke earlier in chat about the problem. You might also be looking at a sensor that plug into the circuit board. The repair costs shouldn't be more than $100.

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1 Answer

My teledyne Laars Telstar Model TGS-50 spa heater will not stop heating at 104 degrees. I have had it go to over 110 degrees before I shut it down. Whats causing this ?

Without doing more troubleshooting i would have to say that it is the main board (the board with the knobs on it) Take it out and see if there is any corrosion on it.

Apr 03, 2009 | Teledyne Laars Laars Lite 2 Pool Heater...

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