81
110331-07 - 8/23
PHTM II
Combi Installation, Operating & Service Instructions
19
Troubleshooting
(continued)
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.
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
E15
Air Proving
Switch (APS)
Defective
(failed to
open)
Defective air proving switch,
failed to open.
• Remove jumper from air proving switch.
• Check continuity on switch. Should be open with no air flow.
Replace switch if necessary.
Blower is running
before start sequence,
communication loss between
control and blower.
• Check wiring between control and blower, correct wiring if
necessary.
• Replace blower if necessary.
• If problem persists, replace control.
H16
E16
Low
Combustion
Air Flow
Air flow is blocked.
• Check vent and air inlet for blockage. Remove blockage.
• Check heat exchanger for excessive fouling. Clean if necessary.
• Check integrity of burner. Replace burner (including burner door) if
necessary.
APS (air proving switch) not
connected to harness.
Connect harness to APS. Note different size spade connectors.
Tube to APS is not
connected or obstructed.
• Check tube is connected and unobstructed.
• Replace tubing if necessary.
Defective APS.
• Check switch for proper operation
-Switch is open when blower off.
-Switch is closed when blower is on (negative pressure)
•Replace APS if necessary.
Defective blower.
• Check blower wiring connections (120 VAC and control
connectors), correct wiring if necessary.
• Replace blower if necessary.
H17
E17
Invalid
Safety
Parameters
[
17
.
0
] Control in program
mode.
Cycle power.
[
17
.
4
] Boiler Type and BCC
mismatch.
WARNING
Asphyxiation Hazard.
Boiler type is factory set and must match boiler model. Boiler type
BCC determines minimum and maximum blower speeds. Incorrect
BCC could cause hazardous burner conditions and improper
operation resulting in severe personal injury, death or substantial
property damage.
To verify boiler type BCC is correct, a qualified technician should do
the following:
• Check boiler model and insert correct Boiler Type BCC.
• Check wiring to Model Key located inside control enclosure.
[
17
.
6
] Invalid fuel or altitude
selection or power is
cycled too soon after a fuel
selection.
Select desired fuel and altitude. If fuel selection [
A06
] on local
display and power is cycled too fast, select original fuel to clear
alarm before reselecting desired fuel.
[
17
.
7
] Parameter transfer
from a new BCC is required
or in progress.
Shows as
H17
on screen. When process complete, screen will return
to normal. No action is necessary.
[
17
.
8
] BCC is missing.
Remove and reconnect BCC and cycle power. Press
!
reset
button after power is re-established. If problem persists, replace
control.
[
17
.
1
,
17
.
2
,
17
.
3
,
17
.
5
,
17
.
6
]
Control is defective.
Cycle power to control, Press
!
reset
button after power is re-
established. If problem persists replace control.
!
