48
TROUBLESHOOTING
Table 10.2 (cont.): Blocking Errors
Error No. Error Display Corrective Action
125 OUTDOOR_OPEN
Outdoor Sensor open
–
Check sensor wiring for solid connection and continuity. Replace wiring if bad
or repair break.
–
Check for resistance though the sensor by touching meter leads across both
pins on the sensor. If no circuit is present replace sensor.
126 RETURN_SHORTED
Return Sensor Shorted
–
Check for resistance through the sensor by touching meter lead across both pins
on the sensor. Resistance should be between 15 kΩ and 500 Ω. If no resistance is
present replace sensor.
127 SUPPLY_SHORTED
Supply Sensor 1 Shorted
–
Check for resistance though the sensor by touching meter leads across the left
two pins on the sensor using when the retaining clip is towards you. . Resistance
should be between 15 kΩ and 500 Ω. If no resistance is present replace sensor.
128 SUPPLY2_SHORTED
Supply Sensor 2 Shorted
–
Check for resistance though the sensor by touching meter leads across the
left two pins on the sensor using when the retaining clip is towards you.
Resistance should be between 15 kΩ and 500 Ω. If no resistance is present
replace sensor.
129 DHW_SORTED
DHW Sensor Shorted
–
Check for resistance through the sensor by touching meter lead across both
pins on the sensor. Resistance should be between 15 kΩ and 500 Ω. If no
resistance is present replace sensor.
130 FLUE_SHORTED
Flue Sensor Shorted
–
Check for resistance through the sensor by touching meter lead across both
pins on the sensor. Resistance should be between 15 kΩ and 500 Ω. If no
resistance is present replace sensor.
132 OUTDOOR_SHORTED
Outdoor Sensor Shorted
–
Check for resistance through the sensor by touching meter lead across both
pins on the sensor. Resistance should be between 15 kΩ and 500 Ω. If no
resistance is present replace sensor.
133 NET_FREQ_ERROR Net freq. error detected by the watchdog. If error persists, replace control.
134 RESET_BUTTON_ERROR
TToo many resets in a short time period
–
Allow a 1 hour wait period for error to clear.
–
Cycle power
135 PHASE_NEUTRAL_RESERVED_ERROR
The line and neutral of the main voltage power supply input are reversed.
–
Check line in power polarity. Correct if reversed.
155 WD_CONFIG_ERROR Watchdog fan configuration setting error. If error persists, replace control.
156 FLUE_PRESSURE_ERROR
Blocked Flue/ Condensate Switch closed.
–
Check for blockages in the vent pipe or heat exchanger.
–
Check for blockages in the condensate system inside or after the
condensate trap. A slow drainage of condensate could cause condensate
back up that will trip this switch under certain conditions.
162 FILL_WARNING
Pressure is too low, demand has stopped, but no error needs to be stored at
this time
165 VSUPPLY_TOO_LOW
Main supply voltage too low for more than 60 seconds
–
Check supply voltage for values below 108 Volts
166 VSUPPLY_TOO_HIGH
Main supply voltage too high for more than 60 seconds
–
Check supply voltage or values above 132 Volts.
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