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110332-04 - 2/23
PHTM II
Installation, Operating & Service Instructions
18
Troubleshooting
(continued)
Code
Name
Possible Cause
Corrective Action
H06
E06
Flue High
Limit
Heat exchanger dirty.
Inspect heat exchanger and clean flue side of heat
exchanger.
Boiler over-fired.
Reduce maximum firing rate.
H07
E07
Return Temp
Higher than
Supply
Flow through boiler
reversed.
Verify correct piping and pump orientation.
Supply or return sensor
defective or not installed
properly.
Check supply and return sensors, correct installation or
replace if required.
No boiler water flow.
Verify system is purged of air and that appropriate valves
are open. Also verify pump is running. Check T5-0 A fuse
(Figures 19-1 and 19-2), replace if necessary. Replace pump
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 18-7). 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 18-7). 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 18-7). 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 18-7). 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 18-7). Replace sensor if necessary.
H13
Header
Sensor Fault
Shorted, opened or
miswired header or
recirculation temperature
sensor.
• Comfort Mode Selected in error. Disable Comfort Mode,
Quick Menu Item
A02
• Check header sensor wiring, correct wiring if necessary.
• Check header sensor, refer to sensor temperature vs.
resistance (Table 18-7). Replace sensor if necessary.
H14
0-10 Vdc /
4-20 mAdc
Input Fault
[
14
.
0
or
14
.
1
]
Shorted or miswired
0-10 Vdc / 4-20 mAdc
input.
(Feature not available with local user display.)
Check 0-10 Vdc/4-20 mAdc input wiring, correct if
necessary.
[
14
.
2
]
Analog input parameter
setup incorrect.
(Feature not available with local user display.)
Check and correct parameter settings.
Table 18-5: Active Fault Code and Corrective Actions (continued)
Detailed Fault Code found on "
b
" and "
c
" menus in brackets, e.g. [
1
.
0
].
