Rheem 871024 - Fault Finding Tests 5-8

TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
37
Fault Finding Tests 5 – 8
Isolate power before removing connector plugs
Test 5
Test 6
Unplug connector B from the PCB and measure
the resistance of the Over Heat Limiter Assembly.
Resistance should be between 50kilo-ohms and
500 kilo-ohms.
Unplug connector K from the PCB. Restore
power and check if error code 79 is displayed
within 30 seconds.
Isolate power when conducting resistance tests. “Live” components
present during voltage tests, exercise caution
Test 7
Test 8 – Diagnostic points 5, 6, 7 & 8
Error
code
Maintenance
Display
Code
Diag
Point
Test Point
Measured
Value
31
3y: Water
Inlet
Thermistor
5
6 Yellow
7 Black
20ºC –
10.3 kilo-
ohms
40ºC –
4.9 kilo-
ohms
32
4y:
Combustion
Chamber
Thermistor
6
5 White
7 Black
33
5y: Hot
Water Outlet
Thermistor
7
4 Red
7 Black
34
2y: Ambient
Air
Thermistor
8
3 Blue
7 Black
25ºC –
5.0 kilo-
ohms
5ºC –
12.7 kilo-
ohms
Use an insulated tool when operating the
DIP switch or MIN and MAX buttons.