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”.
57
Fault Finding Tests 18 - 21
Tests 18 & 19
Conduct test with water & gas isolated
Ensure power is off whilst disconnecting the fan plug
(connector J) from control PCB.
Using a multimeter set on the DC volts scale, insert the
multimeter test probes into the test points, as listed below
for the specific test being undertaken.
Reapply power to water heater. Once initialisation period
has expired (~2mins) depress MIN (SW1) or MAX (SW2)
button to initiate fan operation.
Test measurements are to be as follows:
Test
Check Point
Measured Value
18
6 Red
– 4 Black
(Indoor)
DC144 - 192V
6 White
– 4 Blue
(Outdoor)
19
3 White
– 4 Black
(Indoor)
DC12 - 18V
3 Red
– 4 Blue
(Outdoor)
Test 20 & 21
Disconnect the fan plug (connector J) and power plug
(connector I) from control PCB.
Using a multimeter set on the kilo-ohms scale, insert the
multimeter test probes into the test points, as listed below
for the specific test being undertaken.
Test measurements are to be as follows:
Test
Check Point
Measured Value
20
6 Red
– 4 Black
(Indoor)
481 kΩ (+/- 5%)
6 White
– 4 Blue
(Outdoor)
21
3 White
– 4 Black
(Indoor)
8.1 kΩ (+/- 5%)
3 Red
– 4 Blue
(Outdoor)
NOTE:
Short circuit at test point 20 will damage the transformer and a short circuit at test point 21 will damage the fan.
