Question about Pentair PUREX MINIMAX HEATER; THERMOSTAT, 60 CAPILLARY - 072022
The Propane unit sat idle for 3 years. The first time I used it, it took about 5 minutes to ignite and heated the spa to 105 degrees in about 45 minutes. In subsequent usage the heater would cycle on and off until the proper temperature was met. The last time it was used, it cycled on and off, did not get to the desired temperature and the cycle time between on and off became shorter and the heater would not stay on for more than a minute.
Could be a bad igniter.
Posted on Jun 27, 2017
This may be due to the gas valve being faulty.
Posted on Jun 27, 2017
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Posted on Jan 02, 2017
hello, It sounds like you may not be getting circulation thru the heater. Make sure the valves are open to allow water to pass thru the heating system. Some systems use a bypass on the heater so there is not a lot of wear on the coil system in the heater. If it is not circulating it will get too hot and the safety shut down will occure. If you are getting water circulating thru the heater, then the thermocouple or auto start igniter system is not working correctly. It is trying to start and can't then recycles. If the burners are igniting on the startup and then shutting back down you may have a bad control unit or thermal sensor unit. Since the unit is gas have a professional service it for you. Good Luck, RAC
Posted on Apr 20, 2009
SOURCE: MIni-Max 400 heater cycling
sounds like you may have a water chemistry problem more than a heater problem. High pH coupled with the heat of the exchanger in the heater will allow the calcium in the water to precipitate and scale the tubes of the exchanger. Make sure your water is balanced, pH 7.4-7.6. Water balance factors include pH, total alkalinity, calcium, TDS, and temperature. Use the langlier saturation index to determine your water balance. If your water is balanced, you may have a bad thermal governor. If you hear the heater water hammer and bang around and then shut off, you definitely have a scale buildup in the heat exchanger tubes. Hope this helps...
Posted on Sep 17, 2009
You most likely have a bad water temperature sensor. Replace the water temperature sensor that is probably near the discharge side of the filter pump. That should take care of the problem.
Posted on Oct 22, 2009
Your EO4 message tells you you have a fan problem. So ether your fan is diying wich you would hear or you have a bad presure sensor in your exaust. A new fan is a little pricey but the sensor is reasonable for heater parts. I can't be sure but I believe it ether screws onto or into your exaust and it just plugs on to your control board. If your sensor is going bad their is a reason and this should be addressed. It should be in your by-pass or your gas pressure. But as far as a new heater, not untill you have water coming from the cabnit. It is sometimes easer to sell new than keep up with new, Good luck let me know how you do.
Posted on Dec 03, 2009
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