www.hotwater.com 47
DIAGNOSTIC DISPLAY
By simultaneously pressing the “Mode” and “down arrow” buttons for 3 seconds the unit will allow access to the diagnostic
mode.
In diagnostic mode, using the up/down arrow allows for cycling between diagnostic codes. The numeric display will
show the diagnostic code for 1 second, followed by the actual measurement displayed for 3 seconds. For example, H01
- 105 represents the diagnostic code of “H01” and the value of “105” is the inlet water temperature measurement. The
display will continue to show the diagnostic code and the measurement value unless the up or down arrows are pressed
to switch to the next item (see Table 4). If no buttons are pressed for 30 seconds the unit will revert back to operation
mode where the set-point temperature is displayed.
Diagnostic
Code
Description
Code and
Measurement
Display
Format
Units
(Example of)
Displayed
characters
(Example of)
Meaning
Remarks
H01
Inlet Water
Temperature
H01 – xxx
ºC or ºF
041 or 105
41ºC or 105ºF
ºC LED or ºF
LED turned ON
H02
Heat engine outlet
water temperature
H02 – xxx
ºC or ºF
041 or 105
41ºC or 105ºF
ºC LED or ºF
LED turned ON
H03
Storage tank
temperature
H03 – xxx
ºC or ºF
041 or 105
41ºC or 105ºF
ºC LED or ºF
LED turned ON
H04
Heat engine water
fl ow rate
H04 – xxx
litres/minute
056
5.6 litres/minute
(1.48 Gallons/
minute)
1 litre =
0.264 Gallons
1 gallon =
3.78 litres
H05
Fan Speed
H05 - __x – xxx
rpm
006_511
6511 rpm
rpm=rotations
per minute
H06
Fan Current
H06 - __x – xxx
mA
001_456
1456 mA
(1.456A)
mA=milliampers
H07
Proportional Valve
Current
H07 – xxx
mA
178
178 mA
mA=milliampers
H08
Total Heating
Time
H08 – xxx – xxx
hours
001_234
1234 hours
(51.41 days)
H09
Total Cycles
H09 – xxx – xxx
heating cycles
000_459
459 heating
cycles
H10
Heat Engine
Rated Output
H10 – xxx
KBtu/hour
100
100 KBtu/hour
H11
Current Error
Code (See Fault
Code Table)
H11 – xxx
N/A
E00
Proper operation
- No error
H12 – H20
Error Code
History, From the
Most Recent to
the Least Recent
(See Fault Code
Table)
Hxx – xxx
N/A
E28
Ignition failure
The most
recent error
corresponds
to H12 and the
least recent to
H20
H21
Software
Release Number
(CWHCB)
H21 – xxx – xxx
N/A
002_025
Software release
number 2.25
For the main
controller board
H22
Software Release
Number (UIM)
H22 – xxx – xxx
N/A
002_009
Software release
number 2.09
For the display
board
H23
Confi guration File
Number
H23 – xxx – xxx
N/A
000_006
Confi guration fi le
number 6
TABLE 4
Summary of Contents for Power Vent Gas Series
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