80
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
H06
E06
Flue High Limit
Heat exchanger dirty.
Check heat exchanger for excessive fouling. Clean if necessary.
Heat exchanger cleaning kit available. See accessories section.
H07
E07
Return Temp
Higher than
Supply
Flow through boiler
reversed.
• Verify correct piping and pump orientation.
• Check pump orientation.
Supply or return sensor
not installed properly or
sensor defective.
• Check supply and return sensors are installed correctly.
• Replace if necessary.
H08
Return Sensor
Fault
Shorted or miswired return
temperature sensor.
• Check return sensor wiring, correct wiring if necessary.
• Check return sensor, refer to sensor temperature vs. resistance
(Table 19-7). Replace sensor if necessary.
H09
E09
Supply Sensor
Fault
[
9
.
0
or
9
.
1
] Shorted,
opened or miswired
supply temperature
sensor.
• Check supply sensor wiring, correct wiring if necessary.
•
Check supply sensor, refer to sensor temperature vs. resistance
(Table 19-7). Replace sensor if necessary.
[
9
.
2
] Temperature
difference between dual
elements too high.
Measure resistance of each thermistor and compare, refer to
sensor temperature vs. resistance (Table 19-7). Replace sensor if
necessary.
H10
DHW Sensor
Fault
Shorted, opened
or miswired DHW
temperature sensor.
• Check DHW sensor wiring, correct wiring if necessary.
• Check DHW sensor, refer to sensor temperature vs. resistance
(Table 19-7). Replace sensor if necessary.
H11
E11
Flue Sensor
Fault
Shorted, opened or
miswired flue temperature
sensor.
• Check flue sensor wiring, correct wiring if necessary.
• Check flue sensor, refer to sensor temperature vs. resistance
(Table 19-7). Replace sensor if necessary.
H12
Outdoor Air
Sensor Fault
Shorted, opened or
miswired outdoor air
temperature sensor.
• Check outdoor air sensor wiring, correct wiring if necessary.
• Check outdoor sensor, refer to sensor temperature vs. resistance
(Table 19-7). Replace sensor if necessary.
H13
Header Or
Recirculation on
Sensor Fault
Shorted, opened or
miswired header or
recirculation temperature
sensor.
• Check header or recirculation sensor wiring, correct wiring if
necessary.
• Check header sensor, refer to sensor temperature vs. resistance
(Table 19-7). Replace sensor if necessary.
Recirculation (Comfort)
Mode selected and
recirculation temperature
sensor not installed.
Disable Recirculation (Comfort) Mode or install a recirculation
temperature sensor.
H14
0-10 Vdc / 4-20
mAdc Input Fault
[
14
.
0
or
14
.
1
]*
Shorted or miswired
0-10 Vdc / 4-20 mAdc
input.
• Check 0-10 Vdc/4-20 mAdc input source wiring to boiler, correct
wiring if necessary (for example, swap two wires).
• Verify proper operation of external device.
[
14
.
2
]*
Analog input parameter
setup incorrect.
Verify parameter settings on boiler.
*Feature only available with PAT-Connect Bluetooth Adaptor and App.
