Question about Qca Spas Jewel Series Topaz Plus Hot Tub

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Z110 jacuzzi heater keeps cutting off after 30 minutes. Changed the heater, the pressure switch and tried running with the high limit sensor pulled out of the housing.

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Question is about the heater - is the tub up to temperature when the heater turns off or is the tub running in the filter cycle?

Posted on Sep 06, 2010

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The water temperature needs replacing not the high limit found usually in the filter well

Posted on Jul 20, 2009

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Hello, sounds like the limit switch is opening on the furnace.Usually when a furnace goes off on its high limit is becuase the airflow is being restricted making the furnace overheat. a limit switch is there to protect the furnaace from overheating, most cuases are either dirt or the blower motor not running up to speed, anything that cuts down on the airflow will cause the high limt switch to open.

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Check the Temp Sensor and the High Limit sensor on the system. Make sure the heater light is coming on. if the heat light is not on then the pressure switch is not working but I am thinking more like the Temperature Sensor is not working.

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the high limit is an over heat switch that could mean the unit is over fired. you would need to time input or check manifold pressure. the roll out switch is a switch that shuts the unit off if combustion is spilling at the divitor on the unit where the vent connects. with this you need to check your venting

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sounds like flame sensor.try taking it out and polish with steel wool.flame sensor is a rod that is in flame with a single wire going to it.If there is no flame sensor,check limit switches,but they usually have to be reset when triped.high limits usually reset when cool.check flew for blockage if theres air conditioning,check a coil could be dirty.if every thing else is ok then control board is bad.real hard for nubies to diagnoise.

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when a heater runs for 30 seconds or les some heaters run or about 1 minute this is mostly a problem with how much water is getting in the heater if is too little the pressure switch cuts the heater off or the high limit switch is shutting off the boiler why because the small amount of water getting inside your heater get hot to fast and make the heather to get so hot and the high limit switch turns the heater off the solution is to check your filter make sure is clean or cleaned they get dirty soon if your filter is clean and still doing it check the bypass in the heater normally is located next to the lines going in and out in the heather lines I have fix so many heaters my self I use to have a business in california as swimming pools repair so I know this and your heater is not to big to say is your gas regulator gs regulator is a common problem on heaters ranging on size from 30-36-40 BTU

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The pressure switch is on the inlet/outlet manifold. It has purple wires running to it. Try taking a wire and unplugging the pressure switch and jumping the 2 wires together.

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