Question about Sta Rite Maxi Therm 400k Btu Propane Heater

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What would cause heat exchanger to fail / leak

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Usually poor pH maintenance. It can also happen quickly with improper chlorine tablets use; using a chlorine feeder or generator without a functioning check valve; or improper installation of a chlorine feeder or generator in general.

Posted on Sep 04, 2009

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Posted on Jan 02, 2017

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1 Answer

What caused a loud, low frequency noise upon ignition.


Water in the heating chamber will cause your heater to make these sounds. If your water is cold, it will create condensation inside of the heating chamber. Another way water would get into the heating chamber is if your heat exchangers are leaking. Id check to make sure that heating chamber is not full of water, if theres any real accumulation of water, 2" or more, inside that chamber, the exchanger needs replacing. Otherwise, it sounds like condensation.

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Leaking heat exchanger


balance chemicals in pool and replace heat exchange

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Water flows out the condensation tube even when the heater is not runiing causing the pool to leak down. The heater is 4 years old. Thank you.


It sounds like there is a leak in your system. The condensation tube is to drain off the water because one of the byproduct of combustion is water and it condenses on the heat exchanger. Since it is only 4 years old it might be under warrantee for this issue. The problem might be simple but could be very expensive if the heat exchanger has a leak.

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1 Answer

I'm working on a n-0931m noritz and i have a 61 code flash and water leak out the blower housing i assume the heat exchanger is bad. is a heat exchanger difficult to replace


61 code is a fan motor abnormality. It typically indicates the fan is damaged and needs to be replaced. It can be caused by water leaking onto it from the heat exchanger.

The heat exchanger isn't difficult to replace, but it is confusing if it's your first time doing it. I'd recommend calling Noritz for assitance.

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Flame rollout on ignition causing rollout switch to fail, prior technician to me feels it is the heat exchanger. I feel that if it was the heat exchanger the rollout would occur after the indoor blower...


roll out occurs if there is not enough combustion air at the burners or there is a blockage of the vent pipe. check both for problem. a blocked heat exchanger can also cause a roll out.

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Heater Manifold Return Header Assembly 471991: I have water leaking from my minimax CH 200 heater...


This is likely a leaking heat exchanger. These usually fail due to improper water chemistry. This can happen in less than a year if the chemistry is messed up enough. Most culprits are putting chlorine tablets in the skimmer and running the pH or Total Alkalinity tooo low. HTH

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LLD125 pool heater leaking water from inside


My heat exchanger was cracked. I found an old welder who knew how to weld the cracks for $100 vs $900 for a new exchanger,. Also ordered replacement seals for the 2 chambers. I used high temp automotive engine sealant as an additional sealant precaution. Also inspected tubes and cleaned corrosion. Works fine last 3 years. Takes some mechanical skills.

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Runs hot and hearter not blowing hot air


a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.

last thing you can check if heater core is ok. is the thermostat.

Feb 18, 2010 | 1999 Pontiac Montana

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Heater leaks water on lower left side (side where gas attaches) towards rear. Do not want to take totally apart to get to leak. Side does not appear to come off.


The heater sides do come off. Your heat exchanger will be what is leaking. Some people (I have never tried) have had them welded at a local radiator shops with some sucess though it is likely the heat exchanger will have several thin areas likely to fail in the near future if you have a leak now.

New heat exchangers are expensive. If you would like a quote, contact us with your heater model and serial number at www.arrowpools.net.

The longer you leave it leaking, the more likely you are to damage other parts down in the bottom of the heater so it is not something you should let sit. If you are going to go without it for a while, close the water off if you have a bypass. Otherwise, consider having the plumbing re-arranged to bypass the heater.

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