82
PHTM II
Combi Installation, Operating & Service Instructions
110331-07 - 8/23
19
Troubleshooting
(continued)
Table 19-5: Active Fault Code and Corrective Actions (continued)
Detailed Fault Code found on "
b
" and "
c
" menus in brackets, e.g. [
1
.
0
].
Code/Name
Possible Cause
Corrective Action
H18
E18
Invalid
Application
Parameters
[
18
.
0
] Application parameters
are not valid.
Normal condition following a parameter download, set Factory
Defaults, parameter
A10
. (Table 16-11, Menu
A
, Quick Menu)
[
18
.
1
] Parameter Model
Mismatch.
Repeat reset to factory default using parameter
A10
. If problem
persists, replace control.
[
18
.
2
]* CH Setpoint and
Modulation source both
selected.
Only CH Setpoint or Modulation source may be selected. Select
only a single feature. Check Central Heat Modulation Rate
Source and Central Heat Setpoint Source.
[
18
.
3
]* Invalid header sensor
configuration.
Recirculation vs. Header Selection parameter must be set to
"Header" when selecting CH Modulation Sensor parameter
selection to "Header".
[
18
.
4
]* Invalid Stepped
modulation parameters (Start
Offset Recycle Limit)<5°F
(3
˚
C).
Consult manufacturer.
[
18
.
5
]* Invalid Setpoint
interpolation parameters.
Check CH 20 mA Water Temperature is greater than CH 4 mA
Water Temperature.
[
18
.
6
]* Invalid Recirc
(Comfort) Mode configuration.
Recirc (Comfort) Mode selected and Header/Recirculation
vs. Header Selection parameter is not set to "Recirculation" or
Auxiliary thermostat input selection not set to "Recirculation".
[
18
.
7
] Factory defaults not
turned on.
Ensure BCC is installed and select
A10
factory Default "On"
(Table 16-11).
[
18
.
8
] Pump mismatch.
P02
Boiler Pump Output Selection parameter set to "Pump Not
Used" or
P02
Boiler Pump Output Selection parameter set to
"Boiler Pump CH Only Off for DHW" and
P03
Auxiliary Pump
Output Selection parameter is not set to "DHW Pump Boiler
Piped IWH". Refer to Table 16-15.
E19
Flame Signal
Fault During
Run
No gas, insufficient gas
supply pressure.
• Verify no air in gas line.
• Check gas valve inlet pressure while boiler off and during
operation.
H20
E20
Flame Signal
Fault During
Calibration
[
20
.
0
] No gas, insufficient gas
supply pressure.
• Verify no air in gas line.
• Check gas valve inlet pressure while boiler off and during
operation.
[
20
.
1
] Flame signal too low
during calibration.
• Check air inlet for obstructions. Remove if necessary.
• Check vent and air inlet for evidence of flue gas recirculation.
Change venting to eliminate flue gas recirculation.
[
20
.
2
] Calibration too
different from previous result
and combustion condition
charged too much since last
calibration.
Check air inlet does not contain dust particles or other
combustibles. If possible, relocate air inlet to different location.
[
20
.
3
] Calibration too
different from previous result
and combustion condition
changed too much since last
calibration.
• Check vent and air inlet for evidence of flue gas recirculation.
Change venting to eliminate flue gas recirculation.
• Use PAT Connect Bluetooth Adapter and App to perform
"Calibration Recovery" located under Adjust/Modulation.
[
20
.
4
] Defective control.
Replace control.
*Feature available with PAT Connect Bluetooth Adaptor and App.