American Water Heater RESIDENTIAL HYBRID ELECTRIC HEAT PUMP WATER HEATER Benutzerhandbuch

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As a first step in diagnosis and troubleshooting, the unit should be disconnected from power at the breaker/fuse 

panel for ten seconds, then reconnect power to the unit and determine if the noted error code still appears.  The 

process of waiting for the error code to reappear may take about 8 minutes for the initial power initialization of 

the unit.

No power to the water heater.

Check for blown fuse or tripped 

breaker. Restore power to the unit 

then press power button.

On/Off switch is off.

Press On/Off switch, should be 

illuminated green when energized.

Unit in Vacation mode.

Press Vacation button to turn off.

High temperature limit switch open Reset the high temperature limit 

switch; see “ECO Switch Trouble-

shooting” (p.25)

Non-functioning upper 
temperature sensor

Perform temperature sensor 

resistance test procedure (p.32), 

replace sensor if defective.

Inlet or outlet water valves at the 
water heater closed

Insure valves are fully open

Temperature set point too low

Increase set point temperature; 
see “Adjusting Set Point 
Temperature” section (p.13)

Inlet or outlet valves at the water 
heater are partially closed

Insure valves are fully open

Air fi lter dirty

Clean or replace air fi lter

Hot water usage pattern exceeds 
the capability of the water heater 
in current mode

Change to diffrent mode or modify 
usage patterns

Water connections to unit reversed Ensure the cold connection is at 

the bottom and the hot connection 
is at the top

Heat lost through long run of 
exposed pipe

Insulate exposed piping.

Hot water leak at faucet or piping

Repair hot water leaks

Non-functioning heating element

Test elements and replace as 
required; see details in the 
“Element Test” section (p.22-23)

Sediment or scale build up in tank

Drain and fl ush tank. Water 
conditioning may be necessary to 
minimize build up.

Water heater may be under-sized

Upgrade to larger capacity water 
heater