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Pool heater banging in spa mode

When you put the spa heater on the pool heater starts banging and shuts off-all valves are working

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  • Hayward Master
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Need more info is this dual equipment if so turn the pool heater off when in spa mode also do the opposite when in pool mode

Posted on May 08, 2014

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Posted on Jan 02, 2017

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SOURCE: I have Jandy RS4 system with 4-button poolside

Pull the cover off the control panel. You will probably find a button which would be accessible from outside the panel with a paper clip or pencil but is unlabeled. On the board itself by the button, in small letters it should say "reset". Push the button and see what happens.

Posted on Oct 09, 2009

  • 990 Answers

SOURCE: JVA 2440 rotates continuously in spa mode

If you remove the handel and open thr top of the actuator you will see a set nut on the center of the shaft that you use to set where the valve stops. If this is tight then you may have a bad micro switch in the unit and you should replace the actuator. Good luck.

Posted on Jan 20, 2010

  • 990 Answers

SOURCE: The heater makes a banging sound after the burners

What you have is a water flow problem. The water should be going through the heater but it is by-passing it. The water inside the heater is boiling and trying to expand as steam that makes the banging sound. Their is a internal by pass in the water manifold on the side of the heater. If you take this apart you will find a disc on a spring contraption, if it is stuck open the water goes past the heater but still has pressure to kick the pressure switch and fire the heater. Either clean or replace this assembly. The other thing to check for is an external by-pass. This will be a gate valve bridging the inlet and outlet pipes. If you have one of these it should be 80-90% closed or the water goes through it and creates the same problem. This is not on all systems so don't be alarmed if you don't find it. Good luck.

Posted on Mar 29, 2010

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4 Answers

I have a Jandy Aqualink pool system. When I turn on the spa and heater, the spa drains..I've never had this happen but don't use the spa much. What should I check?


His is not typically a control panel issue but more likely a valve issue.

Your valves are set as follows wih a few minor variations.....
Pool mode- sucks from pool skimmer and or pool vac line and returns water to both the pool and spa.
Spa mode - self contains the spa , meaning water is sucked from the spa and returned only to the spa.
If your spa is draining then most likely one of your electronic valves is failing...most likely it's the return valve so what is happening is the water is sucked from the spa and returned to the pool instead of self containing the spa.
Easy check is to be next to the equip when spa mode is selected and two valves should move and align properly, the return side valve is most likely not moving or it is not moving into the correct position.
The fix is either adjusting the valve acuator or buying a new valve acuator.
Another thing to check is on the main panel circuit board to ensure the return and auction 3 pin plug ins are still connected.

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1 Answer

Raypack 2100 pool heater runs for a couple of minutes then loud banging noise. heater shuts off and error code HL appears


That HL is your high limit shutting the heater down. The banging is the sound of water boiling in the heat exchanger because it is moving too slow. This is almost always the result of the bypass or governor (thermostat) not working properly, so too much water is bypassing the heater. It's not too hard of a fix.

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AGS error code


check gas pressure if ok then see if runs 7 sec if shuts off then check flame sensor if blower doesn't start check safety circuit

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1 Answer

Pool heater is not working properly


So I assume you have pressed the button by pool to select the pool thermostat? If this doesn't work sounds like another mother board problem, or try powering down the unit a few minutes then restart. IF you haven't pressed the pool button, the read this: The heater comes factory set at 78° F. for the pool mode and 100° F. for the spa mode. If it's in spa mode it's trying to get to 100F. Using the up and down arrows,you can set the thermostats to a minimum temperature of 65° F., or a maximum of 104° F. If you desire to heat only one
body of water, the thermostat is capable of an off mode. As an example, if you only wish to heat the pool and not the spa simply depress and hold the spa down arrow, and the thermostat will lower its setting to 65° F. then go to an off mode. Here is a link to your manual :http://www.pentairpool.com/pdfs/MasterTempOM.pdf

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1 Answer

Raypak 2100 pool heater won't heat, PRS and HL2 error codes.


Well, I replaced the pressure switch with no joy. I tried all 5 levels of pressure 1-5 and every wiring combination. Finally, I returned the new $70 pressure switch and took the 2 wires and tied them together (jumped them). Here's the only downside...If you run your pump in backwash, recirc, waste, or any mode that would cause water to bypass the heater it MUST BE OFF. Otherwise, let it ride. It's working great and I hope to go into October weather permitting.

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2 Answers

I want to heat the pool from the spa. I have the spa and spa heat on but the spillover wont come on when I have the spa on. When I turn the spa off the heat goes off. What do I do


When your system is put into Spa mode the system draws water from the spa only to the heater to keep the spa at temp, this is why the overflow doesn't work and why you can not heat the pool in spa mode. If you could heat the pool this way it would take a very long time, since the spa is smaller then the pool. You can heat the pool and spa at the same time in pool mode. Water is pulled from the pool, heated and goes back into the pool and spa.

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1 Answer

Raypak 2100 starts then turns off or shake/bangs off w/error HL1


the heater is plump correctly?if yes assembly valve need replacement, if you by pass before dirt may be inside.

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1 Answer

Heater keeps going off


check the valve assembly may be bad if not the heat exchanger is plug nothing you can do about this

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1 Answer

Why does the spa empty when the pump shuts off? just got a pool with an aqualink RS4 and no manual to look at. thanks


This problem can be caused by a couple things. the two most likely culprtits are either the absence of check valves and or incorrect actuator settings when the pump shuts down.

Your spa is most likely higher than the pool. You most likely have a spill over (waterfall) feature from the spa into the pool. This is so the spa water can be recirculated in pool mode. One of your actuator valves may be slightly off closed position in order to allow spill over in the spa, or you may have a dedicated overfill pipe in the circuit to feed water to spa in pool mode.

Whichever spill over piping you have set up, when the pump shuts down, water from the spa ( higher level than the pool) will backfeed through the overflow spa circuit, back through the pump and into the pool through either drain or return. Effectively rendering your spa level the same level as your pool.

To fix this problem, simply install check valves into the spa runs and as a secondary measure put one into the pool return run ( the run that feeds water to pool).

This will insure that when the pump shuts down, no matter which position the valve actuators may be set, water can not back feed through the pump circuit from spa to pool.

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1 Answer

How/where do I turn on the gas to start it


open shut off valve out side of heater and turn gas valve (inside of heater) to "ON"

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