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Troubleshooting Common Service Problems
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.
PROBLEM POSSIBLE CAUSE TEST/CORRECTIVE
ACTION
NO HOT WATER:
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
INSUFFICIENT HOT WATER
/ SLOW HOT WATER
RECOVERY:
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