SW Open Raypak Heater (2024)

evanwellens

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So I'm back to this problem , more and more frequently now. Cleaning baskets and filters always fixed the issue before , but now we just did the filters 2 weeks ago and the pressure is normal , flow appears normal, no bubbling . Heater wont start sw open. We also get hi limit fault as well , since we've gotten the heater. I know folks say it's a flow problem , but there is no bypass and this is a 2 hp pump, puts out a lot of water. I'm at a loss what to check next ? Any ideas , getting cool and need the heater to not be ou tof commision.

Thanks !!

ajw22

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Jul 21, 2013
54,824
Northern NJ
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35000
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Chlorine
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Pentair Intellichlor IC-60
  • Aug 27, 2023
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  • #2

Hi limit fault is a known problem. Some thermal insulation around the high limit sensors usually fixes it.

Read RayPak Heaters - Further Reading

What is your other problem?

ajw22

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Jul 21, 2013
54,824
Northern NJ
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Pentair Intellichlor IC-60
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  • #3

Remove the cartridges from your filter and see if it clears the SW OPEN error.

If so, clean or replace the cartridges and do a Overnight Chlorine Loss Test

1

1poolman1

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Jul 14, 2014
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  • #4

evanwellens said:

So I'm back to this problem , more and more frequently now. Cleaning baskets and filters always fixed the issue before , but now we just did the filters 2 weeks ago and the pressure is normal , flow appears normal, no bubbling . Heater wont start sw open. We also get hi limit fault as well , since we've gotten the heater. I know folks say it's a flow problem , but there is no bypass and this is a 2 hp pump, puts out a lot of water. I'm at a loss what to check next ? Any ideas , getting cool and need the heater to not be ou tof commision.

Thanks !!

Be sure there is no damage to the pressure switch or wiring, its located on the in/out manifold behind the top removable panel.
How old is the heater? Some had an issue with the High Limit 2 switch that some insulation could solve.
Could be the internal bypass or Uni-Therm regulator causing the hi-limit to trip as well.

evanwellens

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  • #5

ajw22 said:

Hi limit fault is a known problem. Some thermal insulation around the high limit sensors usually fixes it.

Read RayPak Heaters - Further Reading

What is your other problem?

Yes the hi limit is a nuisance , but clears and resets. I do have it on my todo to find an insulation solution, just Leary that causes some damage if the temp is legit too high. SW Open is the other problem.

evanwellens

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1poolman1 said:

Be sure there is no damage to the pressure switch or wiring, its located on the in/out manifold behind the top removable panel.
How old is the heater? Some had an issue with the High Limit 2 switch that some insulation could solve.
Could be the internal bypass or Uni-Therm regulator causing the hi-limit to trip as well.

I guess I need to find a exploded diagram to determine the location.

ajw22

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Jul 21, 2013
54,824
Northern NJ
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SWG Type
Pentair Intellichlor IC-60
  • Aug 27, 2023
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  • #7

The Hi Limit sensors still work as designed for protection with the external insulation on them.

The external insulation keeps other heat from causing them to trip prematurely.

ajw22

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Jul 21, 2013
54,824
Northern NJ
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35000
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Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
  • Aug 27, 2023
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  • #8

evanwellens said:

I guess I need to find an exploded diagram to determine the location.

Look in the Installation Manual.

1

1poolman1

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  • #9

evanwellens said:

I guess I need to find a exploded diagram to determine the location.

Remove the top panel above the inlet/outlet manifold (the plumbing side of the heater) and it is right on top to the left. Looks like a mushroom.

evanwellens

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Thank you all for reaching out so soon. Did clean the filters again and replace. It worked but they really weren't that dirty. These are 2023 filters, and the pressure was very low, which usually indicates not dirty ( over the 12 years I have had this pool. Heater is like 5 years old.

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evanwellens

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Just another observation , recently the heater has been making a moaning noise on occasion. Again on my todo to deep dive this problem , hoped it could wait until the season ended.

ajw22

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Jul 21, 2013
54,824
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
  • Aug 27, 2023
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  • #12

Do a Overnight Chlorine Loss Test

evanwellens

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Jun 9, 2012
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Stony Point, NY
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evanwellens

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Stony Point, NY
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ajw22 said:

Do a Overnight Chlorine Loss Test

What does that indicate ? Chlorine has been pretty steady all summer, I shock when needed and keep the chlorinator filled every 2 weeks.

W

wireform

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Oclt will eliminate the fact or prove you have algae even if the water is crystal clear.

evanwellens

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wireform said:

Oclt will eliminate the fact or prove you have algae even if the water is crystal clear.

It's been crazy raining here , battling algae all summer

evanwellens

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  • #17

Is there any chance adjusting the pressure switch a 1/4 turn might help ? Cleaning filters weekly is getting old quick

ajw22

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Jul 21, 2013
54,824
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
  • Sep 14, 2023
  • Add bookmark
  • #18

evanwellens said:

Is there any chance adjusting the pressure switch a 1/4 turn might help ? Cleaning filters weekly is getting old quick

Running your heater with inadequate pressure and flow can damage the heater and pipes.

Read Heater Flow Switch - Further Reading and check the Raypak Installation Manual on the pressure switch adjustment range or if you should replace it with a flow switch.

evanwellens

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Jun 9, 2012
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Stony Point, NY
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  • #19

Is there any chance adjusting the pressure switch a 1/4 turn might help ? Cleaning filters weekly is getting old quikc

ajw22 said:

Running your heater with inadequate pressure and flow can damage the heater and pipes.

Read Heater Flow Switch - Further Reading and check the Raypak Installation Manual on the pressure switch adjustment range or if you should replace it with a flow switch.

Thank you for your reply. So this heater has been running 5-6 years and this problem only came up recently, and frequently despite constant changing of filters ( actually came up once before and those filters needed to be changed and the pool filter pressure was high) . Also occurs when we turn our Polaris on. It's intermittent and seems to be at the edge of functionality , but becoming a real headache. I'd estimate the pool water level is 2-3 feet below the base of the heater, so it sees to fall within guidelines. So if a minor adjustment to the sensor is too risky , what do you think about just replacing it ?

D

danpik

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Jun 4, 2012
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western NY
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  • #20

evanwellens said:

Just another observation , recently the heater has been making a moaning noise on occasion. Again on my todo to deep dive this problem , hoped it could wait until the season ended.

My heater will do this if I forget to switch the pump to High. My old heater did the same thing. running mine on the high (2 speed pump) eliminates this.

Dan

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SW Open Raypak Heater (2024)

FAQs

Why is my Raypak pool heater not heating? ›

Go make sure there aren't any tripped circuit breakers in the fuse box, then check that the unit's time clock is set to the “On” position. Check Filters & Strainers: Problems with slow or inefficient heating, as well as overly noisy operation, can sometimes be traced back to dirty filters and strainers.

How do I get my pool heater to work? ›

Check that you set the thermostat to the right temperature. If you have a variable-speed pump, make sure that your pump speeds are high enough to kick the heater on. If you are unsure, check the operation manual. If your pool heater is running but the water is not getting warm, check your filter.

How do you bypass a low pressure switch on a pool heater? ›

You can also temporarily bypass the pressure switch by using a jumper wire to make good contact with both terminals on the switch. If the switch is the problem, bypassing it should allow your heater to start running.

Why does my pool heater say service system? ›

SERVICE SYSTEM LED: Indicates insufficient water flow through heater. Ensure filter and skimmers are clean. If LED remains illuminated, switch OFF heater and contact a qualified service professional. SERVICE HEATER LED: Indicates a fault in heater or its controls.

What does the code if mean on a pool heater? ›

There are different models of Hayward units, some use a spark igniter, some use a glow igniter. Most of the time, the IF code means that the igniter has failed, the gas valve has failed, or on units with flame sensing technology, the flame sensor is dirty and needs to be cleaned with sandpaper.

What causes ignition lockout on pool heater? ›

Filters and strainers that are clogged—temperature monitoring requires unrestricted flow. Setting the pool heater to over 105°F is a simple technique to generate temperature excesses and lockouts. Solar heat gain—when the pool is not in use, cover it to keep the sun's heat from altering the water temperature.

Which switch on a pool heater will close on proper water flow? ›

The first one is the pressure switch. This switch makes sure enough water is flowing through the unit before it will let the pool heater turn on.

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