Troubleshooting - Rheem RTEH3512T Guia De Instalacion

EX07200-120 Rev A
ENSURE POWER TO THE UNIT IS "OFF" BEFORE REMOVING THE PROTECTIVE COVER FOR ANY REASON.
For status resolution, please consult the table for your heater model below.
THERMOSTATIC TANKLESS ELECTRIC WATER HEATERS & THERMOSTATIC TANKLESS ELECTRIC WATER HEATERS WITH INTEGRATED MIXING VALVE
Code Name Possible causes
F23 No heat - element failure
- ECO tripped/malfunctioning
- triac(s) failed open
- relay/contactor malfunctioning
- control board failure
- inlet water supply out of spec
F24 Low heat - undervoltage
- triac(s) failed open
- control board failure
- inlet/outlet thermistor(s) failure
F33 Residual heat - internal water temperature elevated
without flow
- both triacs failed closed
F34 Overvoltage - inlet voltage is too high compared to
the stated heater specifications
F36 Undervoltage - inlet voltage is too low compared to the
stated heater specifications
F38 High flow - flow is too high to heat the water to
setpoint temperature
F47 Inlet thermistor - inlet thermistor interrupted or
failure disconnected
F48 Outlet - outlet thermistor interrupted or
thermistor disconnected
failure
F64 Freeze warning - inlet temperature is too low (below
35°F)
THERMOSTATIC TANKLESS ELECTRIC WATER HEATERS & THERMOSTATIC
TANKLESS ELECTRIC WATER HEATERS WITH INTEGRATED MIXING VALVE
DEFAULT PARAMETERS
Status code Model suffix
F33 T
NON-THERMOSTATIC TANKLESS ELECTRIC WATER HEATERS
LED Pattern Status/Problem
Solid light Heating
One flash every four Idle
seconds
Two flashes once, Low heat
three second pause
12

TROUBLESHOOTING

Default values
Trip 170°F
Reactivation 140°F
Possible causes
N/A
N/A
- outlet temperature below 90°F/32°C
for 5 seconds of flow
- element failure
- ECO tripped/malfunctioning
Manufacturer's National Service Department | 400 Captain Neville Dr. Waterbury, CT 06705
Eemax® 800-543-6163 | EcoSmart® 877-474-6473 | Rheem® or Richmond® 800-374-8806
Heater response
Heating will be disabled after 30
seconds of continuous no heat
condition.
Heating enabled, reduced
performance (lower outlet
temperature).
Heating disabled until outlet
temperature falls below the
reactivation temperature (see
default parameters table).
Heating enabled, reduced
performance (higher outlet
temperature).
Heating enabled, reduced
performance (lower outlet
temperature).
Heating enabled, unit operates as
intended (lower outlet temperature
possible).
Heating enabled based on default
inlet temperature setting (see
default parameters table;
higher/lower outlet temperature
possible).
Heating enabled, auto calibration
disabled.
Heating disabled while condition is
present.
Heater response
N/A
- unit waits for flow
- unit keeps running,
LED flashes a warning
pattern
Information contained in this document is subject to change without notice.
Possible solutions
- measure element resistance with
the unit completely turned off
- verify power supply (voltage) while
heater is running
- run water through the unit
- have certified personnel verify the
inlet voltage
- provide voltage within specified
range
- have certified personnel verify the
inlet voltage
- provide voltage within specified
range
- reduce flow (outlet flow restrictor,
faucet aerator)
- inspect connections/wiring of inlet
thermistor
- inspect connections/wiring of
outlet thermistor
- increase inlet water temperature
above 35°F
Possible solutions
N/A
N/A
- reduce flow through
unit