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My pool heater does not run,I turn it on and I get a Flow sign and the pump does not run

1 Answer

Mike Tellegen

Master 1,631 Answers
Posted on May 23, 2015

Mike Tellegen

Master

Joined: Aug 05, 2010

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It would be a big help, if you assist us who would like to help you! Provide more information, be more specific. What heater manufacturer and which model and are you using natural gas or liqu it would be a big help, if you assist us who would like to help you! Provide more information, be more specific. What heater manufacturer and which model and are you using natural gas or propane?
is it a furnace style heater, or is it a heat pump?
otherwise anybody who decides to assist you, is only guessing.

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I turn on the heat pump and I get a Flow sign and the pump does not run

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Fl0 code

Flo ? for Flow Error?

That would for any number of reasons that the Flow Switch is not sensing enough water flow to trip the sensor/pressure switch or actual true water flow switch.

Heater will not run or heat, if there is not enough water flowing!
The heater will sense this. So, whatever will restrict or stop sufficient water flow is the problem.

Dirty filter
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Not enough water in tub or pool - low water level
Clogged pump impeller
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- at pump or at skimmers
Clog / stopped up plumbing line

And finally, you may have a bad flow switch/sensor

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Sep 15, 2013 • Jacuzzi Pool & Spa

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When turning on pool heater after winter being off, heater starts and flow meter needle goed very high and heater stops then displays dhp.

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We have a hot tub or jacuzzi inside or on the side of our pool. We had a new heater installed. The jacuzzi should heat up very quickly but now the pool tech claims the drain from the jacuzzi is blocked,...

Is the equipment to heat and filter the hot tub separate from the pool equipment or do both bodies of water share a common heater and filter pump? In most cases they share a pump and heater with valves that direct the flow of water depending on how the pool owner wants to use the pools.

The first thing you need to determine then is if the equipment is working properly. Is there flow of water to and from the spa? If so, is the heater burner kicking on? If it is running, is it running properly with sufficient gas pressure, 3-4" tall bright blue flames and stays on continuously during the heating cycle for the spa?

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My pool heater does not run,I turn it on and I get a Flow sign and the pump does not run

1 Answer

Mike Tellegen

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Trustworthy Expert Solutions

My pool heater does not run,I turn it on and I get a Flow sign and the pump does not run

1 Answer

Mike Tellegen

Add Your Answer

Attachments: Added items

Related Questions:

Unit will turn on and run but the heater won't get hot.

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How does water flow affect Harwood H100 pool heater

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I have a Jacuzzi J340 Hot Tub. I am having trouble with the heating. When the pump is on, the water circulates just fine. once the heater kicks on, it runs for about 10 seconds, then clicks to OH, and...

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RAYPAK VERSA PLUS POOL HEATER NOT STARTING WHEN POOL PUMP IS ON.

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Unit will turn on and run but the heater won't get hot.

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