Pentair mastertemp 400 won’t turn on: How to fix and Some Related FAQs

Pentair mastertemp 400 wont turn on

Pentair mastertemp 400 won’t turn on – I have a new Pentair mastertemp 400 pool heater for my above-ground pool. My problem is that I have power over the unit. When I hit the power button, it lights up and then buzzes like it’s turning on but will not heat. It’s getting cold here in California, so running the heater for a while would help. Any thoughts?

Well, I am not sure if this will turn on your unit, but it may be worth a try. You said that you have power over the team and that it lights up when you hit the power button. Have you tried to hold the power button down without the heater being plugged in? If you have tried this, then it may be time to start looking for new parts. The switches in the power pack need to be functional for your heater to turn on.

The other thing that I would look at is the control board since you mentioned that it lights up when you hit the power button. Your board may be fried and not letting voltage through to the heating elements. Without being able to test this part, I am not sure if it would be worth purchasing. Your best option, in this case, is to call Pentair, as they will want you to send them pictures of your heater and any other documentation that will help with the diagnosis. They may charge you a small fee, but they also may help you out with this situation.

What if you have done all of these things already and are still having the issue. This is when it may be time to purchase a new one. The Pentair mastertemp 400 pool heater can be found online for $727 with free shipping. It comes with a 2-year warranty, so anything that happens after the first two years would fall on you to repair. This is why I would try and fix it before purchasing a new heater, as the cost can be pretty high.

If you have gotten this far and are still having issues with your Pentair mastertemp 400 pool heater, then please leave a comment below so that others can read about your case if you found this article helpful to do so as well. This will help others with the same problem, so they don’t have to go through and figure out what is wrong on their own.

I hope that this article helped fix your Pentair mastertemp 400 pool heater.

FAQs Related To Pentair mastertemp 400 pool heater

How much does a Pentair mastertemp 400 pool heater cost?

I have heard some say over $800, but I found one on eBay for $625.

How does a Pentair mastertemp 400 pool heater work?

The Pentair pool heater uses a technology called Direct Contact Heat Transfer to heat the water in your pool. This is done by heating an oil-filled radiator and funneling the water through it before it gets back into your pool. The cool thing about this heating process is that you only heat the water that goes through the radiator and does not waste the energy on heating more water than you use. This is what allows the Pentair pool heater to be so efficient.

Can you still get a Pentair mastertemp 400 pool heater?

Yes, there are many places where you can purchase one of these heaters, but I would recommend doing your research before choosing a site as some of them will not have the heater you need. I would check with local pool stores or even online to see who has the best price on your equipment.

What size Pentair mastertemp 400 pool heater do I need?

This depends on few things, such as how big your above-ground pool is and if it is covered or not. You can reference this chart to help you determine the size that you need.

Why does my Pentair mastertemp 400 pool heater shut off?

There are many reasons why your Pentair pool heater might shut off, but the most common is that it thinks there is no water in the system and needs to be primed again. This can be done by pushing the reset button on the back of the heater and holding it down for 5 seconds. If your system is still not working, then you will need to troubleshoot what is wrong.

How many volts does Pentair mastertemp 400 pool heater take?

This Pentair MasterTemp pool heater takes 24 volts so that you would need a 24-volt transformer.

How to wire Pentair mastertemp 400 pool heater?

You would want to run the black wire from your transformer to either the white or green wire on your Pentair MasterTemp pool heater and the other side of the cord into the back of your GFCI outlet box. Run a line from one of the screws on the outlet to your Pentair pool heater, and don’t forget to connect the ground wire from your transformer as well.

Does Pentair mastertemp 400 pool heater come with a warranty?

Yes, every purchase of a Pentair MasterTemp comes with a 2-year limited warranty, but you must have valid proof of purchase.

How many amps does Pentair mastertemp 400 pool heater use?

This Pentair MasterTemp pool heater uses 1.2 amps of electricity per hour, so if you have a 24-hour timer, then the total wattage it would use is 26.4 watts per day.

How big of an area does Pentair mastertemp 400 pool heater cover?

A Pentair 400 pool heater can cover up to an 18 foot above-ground pool.

How long is the Pentair mastertemp 400 cord?

The electrical cord for this unit is 5 feet 10 inches long.

Can Pentair mastertemp 400 pool heater run on solar power?

This model does not have a solar option, so you would need to get a solar blanket if you are looking to heat your pool by using the sun.

How much does Pentair mastertemp 400 pool heater weigh?

This Pentair MasterTemp pool heater weighs about 30 pounds before it is packaged for shipping.

Can I use an extension cord with my Pentair master temp 400 pool heater?

No, it would be best if you did not use an extension cord with this heater as it will cause the wattage to go down, and then your heater won’t operate properly.

What size wire does Pentair mastertemp 400 pool heater need?

This Pentair MasterTemp pool heater would require a #12 wire which could be bought at any hardware store.

Can I use a timer with my Pentair master temp 400 pool heater?

Yes, it is recommended that you use the Pentair 3-Way Digital Timer with this pool heater to give you more control over your energy consumption.

What size breaker does Pentair mastertemp 400 pool heater need?

This Pentair MasterTemp pool heater will not require a breaker as it will be plugged into your GFCI outlet box.

How much electricity does Pentair mastertemp 400 pool heater use?

This Pentair 400 pool heater uses about 26 watts of energy per hour that is on for 12 hours, so you would need to know the wattage of your transformer. This unit can raise the temperature of your pool by about 15 degrees Fahrenheit per hour.

How much does Pentair mastertemp 400 pool heater cost?

The current price for this unit can range anywhere from $200-$300, depending on where you are purchasing it from.

What wire size does Pentair mastertemp 400 pool heater need?

This Pentair MasterTemp will require a #12 wire which can be bought at any hardware store.

Does the Pentair mastertemp 400 pool heater come with a cord?

Yes, this Pentair MasterTemp pool heater will come with an electrical cord 5 feet 10 inches long.

How many amps does my Pentair 400 pool heater use?

The current wattage for this pool heater is 36 watts per hour, so if you have a timer that turns it on for 12 hours, you would need to know the wattage of your transformer. This unit can raise the temperature of your pool by about 15 degrees Fahrenheit per hour.

Can I use an outdoor plug with my Pentair mastertemp 400 pool heater?

No, do not use an outdoor plug with this heater as it will cause the wattage to go down, and then your heater won’t operate properly.

How to fix Pentair mastertemp 400 pool heater.

If your Pentair mastertemp 400 pool heater’s LED light blinks on and off, then the unit is overheating to a tolerance level. Turn the heater all of the ways off for about 30 minutes before trying it again. If this doesn’t work, unplug the heater from its power source and let it sit for several hours before starting it to cool.

How to troubleshoot Pentair mastertemp 400 pool heater.

  1. LED light blinks on and off – The unit may overheat, or the limit switch may be tripped. Allow 30 minutes for it to cool before trying again. If this doesn’t work, unplug the heater from its power source and let it sit for several hours before trying it again.
  2. Temperature doesn’t rise – The heater may be blocked by debris, or the flow rate of the water may be too low. Ensure that nothing is blocking the unit and that there is a good flow rate of water through the unit so your pool’s temperature can rise. If this doesn’t work, unplug the heater from its power source and let it sit for several hours before trying it again.
  3. Water isn’t hot – The thermostat may not be properly adjusted, or the limit switch on the heater may be tripped. Ensure that the thermostat is in the appropriate function/setting for your pool’s temperature, and then try raising or lowering the thermostat temperature. If this doesn’t work, unplug the heater from its power source and let it sit for several hours before trying again.
  4. The Pentair mastertemp 400 pool heater won’t turn on – Ensure that nothing is blocking the unit and that there is a good flow rate through the unit. Also, make sure that the heater is plugged into a working outlet. If this doesn’t work, unplug the heater from its power source and let it sit for several hours before trying again.
  5. The Pentair mastertemp 400 pool heater makes loud banging/clicking noises – This is normal as the parts inside the pool heater are moving.
  6. The Pentair mastertemp 400 pool heater is dripping water – This is normal as the unit heats up and expands the water inside it. This typically happens after not being used or right after being turned on from a cold state.
  7. The Pentair mastertemp 400 pool heater is clicking – This means that the thermostat is tripped. To fix this, unplug the unit for about 30 minutes or so and reset the thermostat as it will be in “test” mode (blinking).
  8. The Pentair mastertemp 400 pool heater’s LED light blinks on and off fast, which means the unit is overheating to a tolerance level. Turn the heater all of the ways off for about 30 minutes before trying it again. If this doesn’t work, unplug the heater from its power source and let it sit for several hours before starting it to cool.

Does Pentair mastertemp 400 pool heater have an auto-shut-off feature?

Yes, the Pentair mastertemp 400 pool heater does have an auto-shut-off feature if something blocks the flow of water through it or if there is a low flow rate. The unit will shut itself off and then automatically turn back on once the issue has been resolved.

Is it safe to leave my Pentair mastertemp 400 pool heater turned on in the event of a power outage?

Yes, you can leave your Pentair mastertemp 400 pool heater on during an extended power outage. The unit has an internal safety feature that will automatically shut itself off after 24 hours if there is no flow of water through it. Once the water starts to flow through the unit again, it will automatically begin to back up.

How much does Pentair mastertemp 400 pool heater weigh?

The Pentair mastertemp 400 pool heater weighs around 140 pounds.

What are the power requirements for the Pentair mastertemp 400 pool heater?

The Pentair mastertemp 400 pool heater uses either 120 or 240 volts with a current rating of 10 amps. The unit is equipped with a 6 ft grounded cord and plug that is either cased in rubber or plastic, depending on which model you have.

What is the Pentair mastertemp 400 pool heater’s warranty?

The Pentair mastertemp 400 pool heater carries a 1-year parts warranty on all internal components and five years on the heat exchanger. This product also has a one-year no-corrosive guarantee on material, finish, workmanship, glass, and tile housing.

How do I know what Pentair mastertemp 400 pool heater model number I have?

The Pentair mastertemp 400 pool heater has a model number located on a sticker on its side. This includes the date, serial number, and type of unit.

That’s all some FAQs related to Pentair mastertemp 400. I hope this article will help everyone who has some problem with their units.

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