83
110331-03 - 1/22
PHTM II
Combi Installation, Operating & Service Instructions
19
Troubleshooting
(continued)
Table 19-6: Detailed Fault Code (found on"
cc
" and "
bb
" menus, continued)
Code Detailed
Code
Type
Condition
H17
E17
H17
.
0
Hold
Control in program mode.
H17
.
1
Hold
Internal Safety Core error.
E17
.
2
Lockout
Parameter CRC error.
E17
.
3
Lockout
Parameter CRC error.
H17
.
4
Hold
Boiler Type and BCC mismatch.
E17
.
5
Lockout
Parameter value read from safety core differs from value read in application MCU.
H17
.
6
Hold
Safety core refused write of fuel selection parameter.
H17
.
7
Hold
Parameter transfer from a new BCC is required or in progress.
E17
.
8
Lockout
BCC is missing, has incompatible software revision or is damaged.
H18
E18
E18
.
0
Lockout
Application parameters are not valid, normal condition following a new parameter
download.
H18
.
1
Hold
Actual boiler model doesn't match with control detected model during factory reset.
H18
.
2
Hold
CH Setpoint and Modulation source both selected.
H18
.
3
Warning
Invalid header sensor configuration.
H18
.
4
Hold
Invalid Stepped modulation parameters (Start Offset-Recycle Limit)<5°F.
H18
.
5
Warning
Invalid Setpoint interpolation parameters.
H18
.
6
Hold
Invalid comfort mode configuration.
E18
.
7
Lockout
Selected boiler model default parameters not available.
H18
.
8
Hold
Boiler pump output parameter set to "Disabled" or boiler pump output set to "Boiler
Pump CH, Off for DHW" and Auxiliary pump outlet is not set to DHW Boiler Piped
IWH".
E19
E19
.
0
Lockout
Air/Fuel ratio outside acceptable limit.
H20
E20
H20
.
0
Warning
Fuel valve or blower demand outside limit.
E20
.
1
Lockout
Ionization current too low during calibration.
E20
.
2
Lockout
Ionization current too high during calibration.
E20
.
3
Lockout
Ionization current lies outside the permissible range during calibration (deviation
from previous level too great).
E20
.
4
Lockout
Calibration result invalid.
H21
E21
H21
.
0
Hold
Ionization current lies outside the permissible range.
H21
.
1
Hold
Gas Valve offset adaption at limit.
E21
.
2
Lockout
Ionization current too high/low after repeated start.
E21
.
3
Lockout
Gas valve current fault.
H22
E22
H22
.
0
Hold
No flame build up at burner start.
E22
.
1
Lockout
No flame build up at burner start.
H23
E23
E23
.
0
Lockout
A flame was detected before burner start.
E23
.
1
Lockout
A flame is detected for 15s, although a valve has been switched off.
H23
.
2
Hold
Flame amplifier fault.
E23
.
3
Lockout
Flame amplifier fault.