Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
24
Error Codes
The following table outlines the error codes, possible causes and diagnostic tests to
conduct. More detailed diagnosis is outlined in the fault finding and operational flow charts.
Error Code
LED pattern
Fault Condition
Items To Check
05
-
Heat Exchange outlet temp too low
Heat Exchanger, Air inlet.
10
-
Abnormal low rate combustion
Blockage in the h/exchanger, fan, air intake or flue
11
A
Ignition failure at start up
Cross light failure
P.G.F.R Valve - diagnostic point 9
G.I.S Valve - diagnostic point 10
Igniter - diagnostic point 11
Solenoid valves 1 & 2 - diagnostic points 12 & 13,
Flame sensors 1 & 2 - diagnostic point 14
12
A
Flame failure during operation
P.G.F.R Valve - diagnostic point 9
G.I.S Valve - diagnostic point 10
Solenoid valves 1 & 2 - diagnostic points 12 & 13,
Flame sensors 1 & 2 - diagnostic point 14
14
E
Over heating
Over Heat Limiter - diagnostic point 2
15
E
Very high temperature
Heat exchanger thermistor - diagnostic point 6
Hot water outlet thermistor - diagnostic point 7
P.G.F.R Valve - diagnostic point 9
16
E
Outlet water temp too high
P.G.F.R Valve - diagnostic point 9
24
C
Operational switch faulty
MAX or MIN button on IC board
29
G
Heat Exchange outlet temperature too
low
Heat Exchanger, Clean air inlet.
31
E
Inlet thermistor open circuit
Water inlet thermistor - diagnostic point 5
32
E
Heat exchanger thermistor open
circuit
Heat exchanger thermistor - diagnostic point 6
33
E
Outlet thermistor open circuit
Hot water thermistor - diagnostic point 7
34
E
Ambient air thermistor open/short
circuit
Ambient air thermistor - diagnostic point 16
35
E
Thermistor connections crossed
Connection points of thermistors
51
F
G.I.S Valve failure
G.I.S Valve - diagnostic point 10
Flame sensor 1 & 2 - diagnostic point 14
52
C
P.G.F.R control failure
P.G.F.R Valve – diagnostic point 9
IC Board
61
B
Abnormal fan speed
Fan motor – diagnostic point 4
65
G
Malfunction of water volume control
motor
Water volume control motor - diagnostic point 15
71
C
G.I.S valve control failure
Gas Inlet Solenoid Valve - diagnostic point 10
IC Board (PCB)
72
D
Detected false flame
Flame sensors 1 & 2 - diagnostic point 8
76
-
Communication problem between
controller and water heater
Controller, IC Board or cable
79
G
Fan motor current detection failure
Fan motor – diagnostic point 4, IC Board
80
F
Gas cut off defective
Solenoid valve 1 & 2 - diagnostic points 12 & 13
Flame sensor 1 & 2 - diagnostic point 14
81
F
Post purge malfunction (Solenoid
valve 1 failure)
Solenoid valve 1 & 2 - diagnostic points 12 & 13
Flame sensor 1 & 2 - diagnostic point 14
82
H
Functional problem on GTC board
Gas type setting failure, IC board
99
G
Abnormal combustion
Blockage in the heat exchanger, fan, air intake or
flue way
Note: Refer to page 20 for interpretation of abbreviations. Refer to page 27 for details on interpreting LED flashing pattern.