62
TROUBLESHOOTING
Table 10.2 (cont.): Blocking Errors
Error
Number
Error Display
Corrective Actions
124
FLUE2_OPEN
Flue 2 sensor open
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 k
Ω
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 k
Ω
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 k
Ω
and
500
Ω
. If no resistance is present, replace sensor.
129
DHW_SHORTED
DHW Sensor Shorted
– Check for resistance through the sensor by touching meter lead across both pins on the
sensor. Resistance should be between 15 k
Ω
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 k
Ω
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 k
Ω
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. Frequency of incoming
power is either less than 40Hz or greater than 70Hz.
– If power supply is from a generator, check that the system is phase/neutral (line voltage
between hot/ground)
– Check boiler earth ground by assuring 0-5 VAC between neutral and ground.
134
RESET_BUTTON_ERROR
Too 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.
163
FLUE_BLOCKED
Flue is blocked, demand needs to be stopped with fan at ignition speed, but no error needed to be
stored at this time/Combustion chamber pressure exceeds 3.5” w.c.
– Check for blocked exhaust outlet.
– Check the combustion chamber pressure (height difference between condensate vessels.)
