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28
Troubleshooting Alarm Codes
Code Troubleshoong Guide Possible Causes What to Do
A125 Lower Element Error or Relay Stuck Closed
Heang element or control board
failure. Heater disabled.
Disconnect power to unit 2. Check
resistance on element per included Ohm
Reading Chart 3. If acceptable ohm reading
is present, replace board 4. If ohm reading
is not as it should be per included chart,
replace
A126 Upper Element Error or Relay Stuck Closed
A127 Element Wire Roung Error
Elements mis-wired or control
board failure. Heater disabled.
1. Disconnect power to unit.
2. Check wiring connecon to heang
element.
3. Ensure both wires are properly con-
nected at element and board.
4. Check ohm reading on heang element
if wires are properly connected.
5. Of acceptable ohm reading is present,
replace board. If not, replace element.
A128 Lower Element Relay Failure to Close Error
Control board relay failure. Heater
disabled.
1. Disconnect power to unit.
2. Check wiring connecon.
3. Check ohm reading if wires are properly
connected.
4. Of acceptable ohm reading is present,
replace board. If not, replace relay.
A129 Upper Element Relay Failure to Close Error
A130 Unit O/Air Temp Freezing: Enable Unit
Ambient temperature is below
freezing. --FREEZE WARNING
Select mode to enable heater (Turn it on).
T131 Clean Filter Reminder
Air lter roune maintenance
reminder
1. Set mode to Electric or OFF.
2. Remove air lter and clean by washing
with a mild detergent.
3. Dry air lter and reinstall.
4. Set unit to desired mode.
T132 Water Heater diculty sasfying demand
Water heater can not sasfy de-
mand
1. Check for open faucets.
2. Check for water leaks.
3. If none present, unit may be improperly
sized.
A120 Shuto Valve Can’t Close Error
Shut-O Valve malfuncon
1. Check connecons of the wiring.
2. Unplug and plug back the Shut-O
valve.
3. If alarm persist, call customer service.
A121 Shuto Valve Can’t Open Error
A122 Shuto Valve Inputs in Error
A123 Shut-O Valve Not Installed
A200 High Water Temp! [ECO] Call Tech Service ECO Tripped. Heater Disabled
1. Disconnect power to unit.
2. Check elements from screw to ground.
3. Check resistance to thermistors.
4. If the issue is neither the elements or
thermistor, replace board.
T300 Water Leak Sensor Not Installed Water Leak Sensor Not Installed
1. Check to ensure water leak sensor is
installed.
2. Check wiring connecons to sensor
from board.
3. Check resistance to sensor to deter-
mine whether sensor or board should
be replaced (See ohm reading chart for
correct readings).
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