American Water Heater HPE10260H045DV Benutzerhandbuch

8

Dry Fire is a term used to describe a heating element 
that is on and not fully submerged in water. This will 
result in permanent damage to the element. The 
dry fi re element protection algorithm is installed on 
this heat pump water heater and prevents damage 
to the heating elements in the event that power is 
applied to the water heater without suffi cient water 
in the tank to cover the elements. 

takes approximately four (4) minutes. If it is 
determined that the element is not fully submersed in 
water, an error will be displayed on the user interface: 
LOW WATER LEVEL ALARM. The water heater will 
not operate while this fault is active and it must be 

cleared before the water heater will operate. In order to 
clear the error, shut off power to the water heater, and 
purge all air from the water heater tank. This is done 
by opening all hot water taps in the building. Run the 
water until there is no air coming out with the water. 
Shut off all hot water taps. Apply power to the water 
heater. After four (4) minutes, dry fi re detection should 
be complete, the error should be cleared and the water 
heater should operate normally. If the LOW WATER 
LEVEL ALARM repeats, purge air from tank again by 
following the method outlined above.

When dissimilar metals are in contact with water, a 
galvanic cell will likely result and corrosion of the metal 
components will occur. If left unchecked, corrosion 
will weaken the wall of a water heater tank which will 
eventually leak. Passive anodes are typically used to 
counteract this corrosion and extend tank life. Passive 
anodes erode over time and become less effective 
until they stop working all together, another type of 
protective device is a powered anode. 

A powered anode is an active device that counteracts 
galvanic corrosion in the water heater tank. Unlike 
a standard depleting anode, a powered anode does 
not lose effectiveness over time. The powered anode 
circuit is made up of an electronic control, a titanium 
anode rod, and the water heater tank. The electronic 
control monitors conditions in the tank and produces 
a voltage that will prevent galvanic corrosion from 
occurring. The titanium anode rod consists of two 
functional parts: A steel body which threads into the 
tank providing mechanical and electrical connection to 
the tank and a titanium rod that is electrically insulated 

from the body. The voltage produced by the powered 
anode circuit  is delivered to the titanium anode rod by 
a red wire connected to the tab that connects to the 
anode rod. Current fl ows from the titanium anode rod, 
through the water and to the grounded tank wall. The 
powered anode circuitry will maintain the minimum 
voltage required to protect the tank steel.

Fault detection is built into the powered anode 
software. If a fault is detected, an error message 
will be displayed on the User Interface Module 
(UIM): “Powered Anode Fault”. By checking the 
fault code history, see “Accessing the Maintenance 
Display” (p.21), a specifi c fault code can be read to 
aid in isolating the cause. Refer to the “Fault Code 
Troubleshooting Guide” (p39-44) for the list of powered 
anode fault messages, what the messages indicate, 
possible causes, and corrective actions.
IMPORTANT: The anode protecting the tank requires 
power to the unit to operate. Do not shut off power to 
the unit for an extended period of time. If power must 
be turned off, drain the tank completely to minimize 
corrosion.