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Why won't our heater heat the pool when the filter is on filter. it only works when it is on recirculate

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Your heater should operate when water is being drawn from the pool through the filter, through the heater and back to the pool.

It will not heat if you are on back wash or if your pump is off.

The heater must have water flowing through it to operate. Think of it like this ... the heater myst be cooled, the cooling water is from the pool. No cooling water, no heat!

Have I answered your question?

Thanks for your interest in FixYa.com

Posted on Jun 04, 2010

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"LO" is simply informing you that the Heater is not sensing proper water flow through it! A Flow Problem.
A special sensor, called a pressure switch is this source. But... That does not mean it is bad - No, it is in most cases just doing its job!
Most common reason - Dirty Filter.
A good cleaning of the cartridges, or maybe a breakdown and recharge of a DE Filter, or a good cleansing backwash of your sand filter, will remedy this situation.
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Hi. I just bought a house with a pool and Raypak RP2100 heater. The pool company came out and opened the pool and started the heater. It ran for a few days and has quit running completely. the pilot light...


Thank you for posting your question here on Fixya.com.

What type of filter do you have: Sand, Earth (DE) or a cartridge? The most likely reason it worked and has since quit is your filter has become dirty enough inside that the flow thru the pump and heater are reduced too low...there is a switch in the heater that senses this and turns the heater off to avoid boiling the water. Cleaning or backwashing the filter should fix the problem. If you have a sand filter or a cartridge filter look at the valve and see if there is a recirculate setting. If so, turn off the pump and change the valve to this setting. Turn everything back on...the heater should start to work. This would verify the filter just needs to be cleaned.

If you need help with the filter please add a comment with the filter details.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!

John

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