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”
44
Fault Finding Chart 3.6
Is error
code 65
displayed?
YES
NO
Water flow
servo
malfunction
Tests 23,
24 & 25
3.6
Replace water body assembly.
3.7
Integrity temp
set below 46
degrees.
Integrity temp
set above 46
degrees.
Is
the bypass
solenoid open
circuit?
YES
Is the
PCB supplying
power to the
solenoid?
NO
Replace PCB assembly.
NO
Is
diagnostic point 18
normal?
Test 30
Note: the bypass solenoid is activated only
if the set temperature is below 46 degrees.
Is the
voltage at connector
between H2 & H8 and H7
& H8 normal?
Test 31
NO
NO
Replace water body assembly.
YES
Tests 23 & 24
Is the water
flow servo motor at
ON position?
YES
Isolate and
then restore
power.
Is the water
flow servo motor
functional?
NO
Test 25
After power is restored the
water flow servo motor
limiter should move to the
fully open position
NO
Set the hot water
temperature at 60º
and fully open a
hot water tap.
YES
*Is
maintenance
information 5y
displaying
60?
NO
*5Y is the temperature of the
hot water outlet thermistor
YES
Is error
code 52
displayed?
NO
Is the
resistance of the
proportional gas flow
regulating valve
normal?
YES
Replace PCB assembly.
YES
Test 15
Replace the proportional gas flow
regulating valve.
NO
Mechanical
bypass (models
without -B or -C
suffix in model
number)
YES