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Troubleshooting
Troubleshooting Guide
Error Code
Error
E56
Sequence control data
invalid.
E57/U0
L1 voltage - over
voltage.
E58/U0
L2 voltage - over
voltage.
E59/U1
L1 voltage - under
voltage.
E60/U1
L2 voltage - under
voltage.
E61
L1 voltage - high
voltage.
E62
L2 voltage - high
voltage.
E63
L1 voltage - low
voltage.
E64
L2 voltage - low
voltage.
E66
Thermal cutout tripped. The thermal cutout
E67/F16
Thermostat 280C or
thermostat 160C
tripped.
E68/A1
Water tank is leaking.
E69/F21
Water tank not
initialized.
E70/F21
Drive switch for the
water tank error.
827703 REV B.1
Possible Cause
Test/Action
Error only occurs
1
during operation.
2
Voltage at L1 greater
1
than 280 VAC for more
2
than three seconds.
3
Voltage at L2 greater
1
than 280 VAC for more
2
than three seconds.
3
Voltage at L1 was
1
between 155 VAC and
2
176 VAC.
Voltage at L2 was
1
between 155 VAC and
2
176 VAC or 0 VAC.
Voltage at L1 was
1
between 260 VAC and
2
280 VAC for more than
3
three seconds.
Voltage at L2 was
1
between 260 VAC and
2
280 VAC for more than
3
three seconds.
Voltage at L1 was
1
between 176 VAC and
2
198 VAC for more than
3
three seconds.
Voltage at L2 was
1
between 176 VAC and
2
198 VAC for more than
3
three seconds.
If the error is repeating:
trips at 500ºF and
resets automatically.
1
2
Most often a fan or
1
temperature sensing
2
issue.
3
Relay board problem
with Exx/F8 or E54/F7.
If thermostat 280C or
thermostat 160C has
not tripped and E67
has happened more
than once, check E66.
1
2
3
Sequence errors E70,
See E70, E71, or E72.
E71, and E72.
Rack and pinion
Inspect the water tank drive for blockage, wiring, and
blocked.
mounting.
Switch on drive board
Replace the valve assembly.
not mounted correctly.
88
CSO (SWS #13543126)
Turn the power to the unit off and then back on
again. Run unit again.
Replace the control board.
Problem with the power supply.
Moisture on the relay board.
Replace the relay board.
Problem with the power supply.
Moisture on the relay board.
Replace the relay board.
Problem with the power supply.
Replace the relay board.
Problem with the power supply.
Replace the relay board.
Problem with the power supply.
Moisture on the relay board.
Replace the relay board.
Problem with the power supply.
Moisture on the relay board.
Replace the relay board.
Problem with the power supply.
Moisture on the relay board.
Replace the relay board.
Problem with the power supply.
Moisture on the relay board.
Replace the relay board.
Check the resistance of the thermal cutout.
Replace the relay board.
Check the resistance of the thermostat.
Check the operation of the convection fan and
room air fan.
If E66 has occurred several times, replace the
relay board.
Inspect the water valve.
Inspect the water sensing system.
Replace the control board.
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