Question about Pentair 250k Minimax Ch Ng Mv Heater

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I have good pressure at the filter when operating the pool and the heater works fine , but when I put it to the spa the pressure on the filter tank goes high and the heater goes to service .

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  • sloehnert Sep 09, 2009

    no seperate valve or filter . I have a rainbow auto clorine 3 inch . the ajustment valve doesn't seem to adjust anymore . could this be the problem . heater still works fine on pool side .

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Does the spa have a seperate filter or valve system? Sounds like either the filter is dirty or a valve is closed. High pressure indicates a closed line and the heater will not work if there is no flow.

Posted on Sep 09, 2009

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Spa indicator says Water SW Open...what does that mean and how do I fix?


This means that the pressure switch is not closing. Generally, this is a lack of water flow issue. The main cause is a dirty filter. Clean cartridges, backwash sand, backwash and recharge DE, whatever is needed to clean the filter, this should fix the problem. If not check other sources of restricted flow: filter baskets, pump baskets, shut-off valves. If everything is clear and there is good flow returning to the pool it could be a bad pressure switch. Replace with the correct switch for your heater.

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There is a flow switch if that's not working. same problem needs to be tested Gas valve solinoid could cause this Igniter could cause this problem Gas pressure regulator wrong pressure should be about 2.7KPA LPG Gas valve should be set to about 2.6 KPA LPG

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I received a notice that the filter needs cleaning. How do I do that?


THis is a PRS code (clean filter/strainer) correct?
This simply means that either there is no water flowing through the pool heater (possibly due to a dirty filter)
If you know you have good water flow, then your pressure switch has failed. Replace the pressure switch.

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The pressure switch light is illuminated and that is the only light that is on. The pool heater was shut off in the spring and worked well then. We put in a brand new filter just before leaving for home,...


Check to be sure that your gas valves are on at the house or tanks and outside and inside the heater. Then be sure to bleed the gas line. If it has sat for a while the gas could have disapated from the line. To do this just shut the gas off outside the heater and open the line by loosening the flex line or the union at the heater. Open the gas untill you smell gas, then shut the gas down again and tighten the fittings up again. Then give it about ten or twenty min. for the gas to clear, open the valves again and see if this helps. Good luck.

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I have an aqualink rs and my spa heater isn't working. I checked the propane and it is full. The heater was working 2 days ago. Now I turn spa and spa heat on the filter pump comes on and the red light...


If the Aqualink is calling for heat then the problem is most likley in the heater. Without more information I can't tell you much more but if nothing has changed in the last couple of days. Before you call anyone be sure to clean your filter and baskets. The heater need a set amount of pressure to run and if things are dirty it won't get that pressure. Good luck.

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On the side of the heater where the pipes are connected; under the top cover. It is a round disk threaded into the header. It is likely that your filter needs a good cleaning if your heater has always worked reliably in the past. If you have a cartridge filter, it may be time for a new element if you can no longer get it clean enough to get the heater to work.

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Low out put voltage from the pilot generator and/or an open circuit in the control circuit...the most common is a bad pressure switch (dirty filters can hamper pressure switch operation).

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My pump pressure is 10psi i cleaned the de filters they seem fine i have good floe out of my jets but when i hook the pool cleaner up pressure drops to almost nothing. could my impeller be the problem


The pressure you are reading is the pressure in the filter tank as water is pumped though it. When the filter is freshly charged, 9 PSI is a good pressure.

As the filter removes particles from the water the filter gets "dirty" -- it takes more pressure to push the water through it thus raising the PSI.

I think you are viewing this in reverse. Low filter pressure is "good" (as long as it stays above 8 PSI) -- as the filter cleans the water the PSI will increase -- when it gets to 15-20 PSI it needs to be back-washed and recharged.

The pressure drops when the pool cleaner is connected because pool cleaners always pull in air (in varying amounts) because of all the hose connections. This causes your filter/tank pressure to drop.

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Pool and spa heater will not turn on, low pressure on display


1) check the fuse on the transformer. You will get "low pressure" if the fuse is blown.
1a) remove front panel with flat head screw driver turning both big screws 1/4 turn clockwise
1b) look up under the 1 remaining front piece for 2 screws (one on each side). remove them and the 1 small panel slides down
1c) transform is directly in the center of this compartment
1d) red wire on transform has a black fuse case - twist open and check fuse (with an ohm meter it should read a dead short if it is working).
1e) if not working - replace with standard 250v 2a bus fuse.
2) it really is low pressure
2a) backwash pool or at least make sure pressure in filter take is not too high (high filter tank pressure == low water pressure in heater)
2b) if you have a bypass valve make sure it is not in bypass mode so most all pressure from the pump is going tothe heater
2c) right next to the transformer is the pressure switch. It has a small copper tube attached to the back and 2 wires in the front. Put an ohm meter across the two leads on this device. With the filter off it should be open, with the filter on it should be closed (short). If not either the copper tubing is clogged, the switch is faulty, or there is not enough water going through the heater. The amount of water that goes into the heater is adjustable and the water pressure switch is also adjustable. The owners manual explains how to adjust both but neither should need adjustment unless you have a special configuration (explained in the manual).

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