Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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How does heater work to keep freeze off pool in winter

Since temps are dropping at night, pool often turns on and water circulates. Last night, pump running, no water circulation. Is this the heater? does it run on electricity or gas? I have inherited this home and pool. Propane tank is empty. do I need it filled to keep pool from freezing in winter?

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What state do you live in, what is the brand name and model number of the heater. If you live in a state that gets cold during the winter, call you local pool store and schedule a closing. If the pump is running and water is not circulating, most likely the pump lost prime or your filter needs to be backwashed, or there is some debris in the impeller.

Posted on Jan 08, 2009


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Posted on Jan 02, 2017


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I have a Canadian spa swift and the pump is beeping with error code E7 can anyone help

E7 is a DRY heater fault.

Check the following first:
1) Water level - Have you filled the spa with enough water?
2) Filters - Are the filters blocked, when did you last clean/replace the filter?
3) Is the circulation pump running? If you can hear the pump, can you see/feel the water circulating? If you can't feel the water circulating but you can hear the pump, then you may have an air lock within the pump/heater.

Canadian Spa Co. do offer their own repair service for these spas. Basically they collect the faulty pump unit, repair it and then send it back. Although it isn't cheap and you should check the basics first.

Good luck,
Ian Kime.

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1 Answer

Our hot tub will only heat when jets are on?

Depending on the design tubs and pools need water to be circulating before heater runs to prevent the heater from burning out. If the circulation pump runs constantly the heater should work any time but a plugged or restricted filter might not let it flow like it needs to.
If the pump only runs in the jet mode then it might be the way it is designed.
Try checking with the manufacturers website for an FAQ section.

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1 Answer

What would cause the pool heater to automatically come on in the middle of the night when the cleaner and water circulator comeson

Heater is probably always powered?
Water is always circulating thru it, whenever the pump comes on.
So, if there is a demand for heat or there is a "Heat Call", the heater will fire and run until the heat demand is met.

If this is the case, just turn the heater off.

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1 Answer

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The wiring is not what makes a pump full cycle or circulate. If the spa motor is always on it is either because the pump relay is stuck closed, or the heater isnt keeping temerature therefor requiring the pump to be constantly running. There are also setting on newer style computer boards which determine a pump to be either "jet" or "circulation" pumps.

Also, a spa pump will run fulltime if the water is below 50 degrees F.

If you need further help, contact me @

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1 Answer

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1 Answer

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1 Answer

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