Bad heating element. Shut the power to the breaker off, disconnect the wires off of the heating element and then check for (ohms) continuity across the two element leads. If it show OL on the meter then you here is an open in the element and it will need to be replaced. Good luck.
SOURCE: No Heat from Spa
Tcarrigan,
Heater contactors "buzzing": Do you mean normal buzzing or extra loud buzzing? Loud buzzing or chattering can be caused by low voltage to a contactor. If normal sounds, then probably the relays on the contactors is working, but the contacts may be stuck, or burned enough so as not to make contact. First, get a voltmeter and check for 240 volts AC at the heater contactor terminals. If the voltage is low, most likely you need to check the contactors further. Check for dirty contacts, clean if needed. If the contacts are not moving when energized, then you will probably need to replace one or both of the contactors.
SOURCE: Minimaxpower on but fails to start no error code just flashes off
hi, it seems like a component malfunction, Try a hard reset Just unplug the power cord for 30 minutes or more, then try again.
SOURCE: My Raypak versa gas heater for my hot tub will not
Water flo through the heater is too fast and the water can't get hot enough. Your by-pass valve is stuck closed and you need to open your water header and check it out. Or you may have an external by pass that need's to be opened 10-20%. This will be a valve between the inlet and outlet water pipes going to the heater. Good luck and HAPPY NEW YEAR.
SOURCE: Pool heater ignites but does not fire for more
The users manual for these pool heaters has a very detailed flow chart that troubleshoots these problems. This is going to be your best bet. The link below is a a pdf version of the manual. It should help.
http://www.backyardcitypools.com/images/bwp/Max-E-Therm-Manual.pdf
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