TM049 27L Continuous Flow Service Instructions
REV AL
– Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support.
All printed copies are deemed “uncontrolled”.
37
ERROR CODES
Code
Fault
Point to Check
03
EZ Link
Check communications cable. Ensure dip switch 4 on DIP1 set of
switches is in the ON position on both heaters.
05
Imperfect Combustion
Alarm
Clean air inlet filter. Clean combustion air fan. Clean heat exchanger
fins. Check for adequate combustion air ventilation openings and
clean if necessary. Check vent system for partial blockage and correct
as necessary.
10
Air Supply or Exhaust
Blockage
Warning code not a fault code.
Check all vent components for proper connections. Ensure there are
no restrictions in the flue inlet or exhaust. Ensure condensation
trap/drain was installed correctly. Ensure heat exchanger fins, fan,
and air intake are not blocked.
11
No Ignition
Ensure gas supply to the appliance is turned ON. Ensure gas type
and pressure is correct. Bleed all air from gas lines. Ensure gas line,
meter, and regulator are sized properly. Ensure appliance is properly
grounded. Check gas solenoid valves for open or short circuits.
Ensure igniter is operational. Check igniter wiring for damage. Check
heat exchange thermistor and transformer.
12
Flame Failure
Ensure gas type and pressure is correct. Bleed all air from gas lines.
Ensure flame rod wiring is correct. Check flame rod for carbon build-
up. Ensure gas line, meter, and regulator are sized properly.
Ensure appliance is properly grounded. Check gas solenoid valves
for open or short circuits. Check power supply for proper voltage and
voltage drops. Disconnect remote control. Check heat exchange
thermistor and transformer.
14
Overheat Limiter Fault
Ensure high fire and low fire gas burner pressure is correct. Check
gas type of unit and ensure it matches gas type being used. Check
heat exchanger for cracks and/or separations. Check gas type
connector. Check for restrictions in airflow around unit and vent
terminal. Check over heat limiter wiring and ensure it is plugged in
correctly. Check
15
Boiling Safety Device
Check for closed water heater inlet valve or restrictions in cold water
inlet pipe (must be fully open). Check for clogged heat exchanger
(scale build up). On a commercial water heater, lower the set point
temperature below 82°C at high altitude. Check heat exchange and
hot water outlet thermistor.
16
Over Temperature Warning
Check for blocked heat exchanger. Check for restrictions in airflow
around unit and vent terminal. Check PGFR, heat exchanger
thermistor and hot water outlet thermistor.
24
Malfunction of Operational
Switch
Disconnect remote control and retry. Verify unit is electrically
grounded. Ensure Min, Max and/or Adjuster buttons have not been
inadvertently depressed.
29
Heat Exchanger Outlet
Temp. Too Low
Check air intake filters and heat exchanger fins.
31
Water Inlet Temperature
Sensor Fault
Check sensor wiring is intact and not damaged. Check and clean
scale from sensor if necessary. Ensure resistance is correct.
32
Heat Exchanger
Temperature Sensor Fault
33
Outgoing Water
Temperature Sensor Fault
34
Ambient Air Temperature
Sensor Fault
35
Improper Thermistor
Connection
Check that all thermistors are connected to proper connections on
PCB. Ensure the hot and cold plumbing to the heater is not reversed.
