35
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Fault Finding Test 16
Are any cables/components inadvertently
depressing the Min or Max buttons on PCB?
Error Code 24
Malfunction of Operational Switch. At a minimum check the following:
1 Verify unit is electrically earthed. Do not use a 2 prong electrical adapter on the power
cord.
2 Check for presence of return circulation pump in the system. Any water flowing through
the unit prior to turning unit ON may cause error code 24.
Error Code 24
Release the Min/Max button.
Is the Min or Max button
depressed?
TEST 16
NO
YES
Replace the control PCB.
Error Code 29
Heat exchanger outlet temperature is too low.
Error Code 29
Measure the hot water outlet
temperature
Does the measured hot water
temperature match that
indicated by 5y?
Is the resistance of the hot
outlet thermistor normal?
TEST 15
NO
Check the burner pressure and
adjust if necessary.
Refer to section on burner
pressure adjustment
Replace hot outlet thermistorNO
Replace PCBYES
YES
Display maintenance information
„5y‟ on remote control
Is the resistance of the heat
exchanger thermistor normal?
TEST 15
Replace heat exchanger
thermistor
YES
NO
Check heat exchanger for
blockage/restriction (possible
scale build-up). Ensure air inlet is
clear and free of debris
SW1 SW2 SW3
DIP1
1 2 3 4
ON
OFF
OFF
ON
4321
DIP2
Ensure the min/max
buttons are not depressed.
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