This is a 1985 commerical pouromatic pn 658
This can be caused by scale build-up on the thermostat probe that hangs inside the tank. The scale stays hot for a long time, tricking the thermostat into believing that the water is still hot. Try pouring 1 Qt white vinigar into the unit, let it warm up completely, run a pot of clear water thhrough the machine, then turn the unit upside down over a sink (making sure it's unplugged first, and always keeping the fill hole down at all times) to let it drain out all the way. Then before you plug it back in, pour water through the machine until water comes out the sprayhead. Then plug it in, let it heat up, pour 2 pots of water through the machine & see if it heats up properly. If this doesn't cure your problem, your unit may need to be completely dismantled to de-scale the tank & thermostat probe.
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