13
5) TROUBLESHOOTING
For fault code resolution, please consult the table below. For advanced troubleshooting, please call our
Technical Service Department.
Fault
code Fault name
Possible causes
Heater response
Possible solutions
F23
No heat
- element failure
- ECO tripped/malfunctioning
- triac(s) failed open
- relay/contactor malfunctioning
- control board failure
- inlet thermistor failure
- inlet water supply out of spec
- unit attempts to
operate for 30 seconds,
then shuts down* if
condition continues
- verify inlet water
pressure fluctuations are
not present, then cycle
the power to the unit
F24
Low heat
- severe undervoltage
- triac(s) failed open
- control board failure
- inlet/outlet thermistor(s) failure
- unit keeps running at
reduced performance
(lower outlet
temperature)
- verify power supply
(voltage) while heater is
running
F33
Shorted
triacs
- both triacs failed closed
- unit shuts down*
F34
Overvoltage
- inlet voltage is too high
compared to the stated heater
specifications
- unit shuts down*
- have certified personnel
verify the inlet voltage
- inlet voltage drops
below fault threshold
F36
Undervoltage
- inlet voltage is too low
compared to the stated heater
specifications
- unit keeps running at
reduced performance
(lower outlet
temperature)
- have certified personnel
verify the inlet voltage
- inlet voltage rises over
fault threshold
F38
High flow
- flow is too high to heat the
water to setpoint temperature
- unit keeps running at
reduced performance
(lower outlet
temperature)
- reduce flow (outlet flow
restrictor, faucet aerator)
F47
Inlet
thermistor
failure
- inlet thermistor interrupted or
disconnected
- unit keeps running at
reduced performance
(longer response time)
F48
Outlet
thermistor
failure
- outlet thermistor interrupted or
disconnected
- unit keeps running at
reduced performance
(difficulties maintaining
setpoint temperature
due to inlet voltage
fluctuations)
F64
Freeze
warning
- inlet temperature is too low
(below 35°F)
- inlet thermistor failure
- unit shuts down*
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