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”.
53
Error Code 24
Malfunction of Operational Switch. At a minimum check the following:
1 If fitted, disconnect remote temperature control and retry.
2 Verify unit is electrically earthed. Do not use a 2 prong electrical adapter on the power
cord.
3 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.
Test 16
Are the controller cables or any other
cables/components inadvertently depressing
the Min/Max or Adjuster buttons on 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 thermistor
NO
Replace PCB
YES
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
4
3
2
1
DIP2
Ensure the min/max
buttons are not depressed.
