19
TM061 Rheem 27 Water Star Service Instructions
– Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
Service. Al
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ERROR CODES
Code
Fault
Point to Check
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.
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 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 harness for
damage.
12
Flame Failure
Ensure gas type and pressure is correct. Bleed all air from gas lines.
Ensure flame rod wire is connected. 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 and re-connect all wiring harnesses on unit
and PCB.
14
Overheat Limiter Fault
Ensure high fire and low fire manifold 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.
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).
16
Over Temperature Warning
Check for clogged heat exchanger. Check for restrictions in airflow
around unit and vent terminal.
24
Malfunction of Operational
Switch
Verify unit is electrically grounded. Press max button on PCB to reset;
Press min button on PCB to reset.
29
Heat Exchanger Outlet
Temp. Too Low
Clean 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.