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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