Periodic Maintenance - Rheem RTEH1812 Guide D'installation

EX07200-120 Rev A
Two flashes twice, Outlet thermistor failure
three second pause
Two flashes three Over-temperature
times, three second Warning
pause
Three flashes once, Over-temperature
three second pause Protection
Three flashes twice, Freeze warning
three second pause
The heater is designed for many years of carefree use. In order to maintain consistent water flow, it may be necessary to periodically
clean the faucet aerator or the filter screen located in the brass inlet fitting at the heater.
Element cartridge
installs inside heating chamber of all
heaters
Non-thermostatic Tankless Electric Water
Relay
Electrical cut-off
(ECO)
Terminal block
Control board
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
Information contained in this document is subject to change without notice.
- relay/contactor malfunctioning
- control board failure
- inlet water supply out of spec
- outlet thermistor interrupted or
disconnected
- outlet temperature exceeds
110°F/38°C
- outlet temperature exceeds
150°F/65°C
- inlet temperature is too low (below
35°F/2°C)

PERIODIC MAINTENANCE

Heaters
- unit keeps running,
LED flashes a warning
pattern
- unit keeps running,
LED flashes a warning
pattern
- unit stops heating until
outlet temperature falls
below preset minimum
- heating disabled
Thermostatic Tankless Electric Water
Heaters & Thermostatic Tankless Electric
Water Heaters with Integrated Mixing
Valve
- inspect
connections/wiring of
outlet thermistor
-increase flow through
unit. If this temperature
is desired no action is
required
- increase flow through
unit to decrease the
overall temperature rise
- increase temperature of
inlet water to meet
product specifications
Triacs
Heating chamber
Triacs
Contactor
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