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 jandy.com

Posted on Sep 01, 2009

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Posted on Jan 02, 2017

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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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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.
If the Heat indicator light IS on then you probably just need a Sensor.
It is always possible that the heater relay on the circuit board is bad.

Rod
US Parts Center
888-521-6183

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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.

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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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E04 message on MiniMax NT 400 DV..Help!!


Your EO4 message tells you you have a fan problem. So ether your fan is diying wich you would hear or you have a bad presure sensor in your exaust. A new fan is a little pricey but the sensor is reasonable for heater parts. I can't be sure but I believe it ether screws onto or into your exaust and it just plugs on to your control board. If your sensor is going bad their is a reason and this should be addressed. It should be in your by-pass or your gas pressure. But as far as a new heater, not untill you have water coming from the cabnit. It is sometimes easer to sell new than keep up with new, Good luck let me know how you do.

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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.

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