Question about Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater...

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PowerStar AE125 seems to have failed

This morning I received only a dark grey water discharge when turning on the hot water in the shower. The flow was greatly restricted. I checked the circuit breakers and one was tripped. When I reset it, the grey water continued, but was very hot and the flow still restricted. Any suggestions before I replace the unit?

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The circuit board is gone bad, try this, with power off reset the overload on the heater.Turn power back on and turn on water to the unit. with no taps open hold the pipe near the left element for a few minutes. it will most likely getting verry hot and trip the overload.(this is done with no water running and power on to the unit).you may even hear the water in the left elemnet start to boil or sizle. the reason for this is the triacs on the cir board are bad.I have troubleshoot this troblem many times. the design is bad and their in now a new unit (redesign) out . bosch knows their junk and wont cover them beyond 1 yr. one way around it is call tech at bosch and tell them its leaking. the u will get one of the new designs. Also applies to the AE125, Rp27pt

Posted on Mar 07, 2012

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You have a blown element. If you purchased the heater, call Bosch for technical assistance, and the unit should be under warranty. The grey matter your getting is the magnesium that the elements have in them.

Posted on Jan 19, 2009

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kindly

Richie

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