Weil-McLain Aqua Balance WMB-155 Manual page 92

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AquaBalance
34 Troubleshooting
Figure 116 Troubleshooting suggestions — Fault displays and diagnostics
Display
FAULT 11 = CH return sensor out of normal operating range (short circuit or open circuit). If sensor goes outside the range,
error will be generated. In case sensor is back to the normal operating range, error is gone. In error mode, heat
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the operating range. Resolving situation can be achieved only if the sensor is within operating range again.
FAULT 12 = DHW sensor out of normal operating range (short circuit or open circuit). If sensor goes outside the range, error
will be generated. In case sensor is back to the normal operating range, error is gone. In error mode, only DHW
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outside the operating range. Resolving situation can be achieved only if the sensor is within operating range again.
FAULT 13 = Exhaust sensor out of normal operating range (short circuit or open circuit). If sensor goes outside the range,
error will be generated. In case sensor is back to the normal operating range, error is gone. In error mode, heat
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the operating range. Resolving situation can be achieved only if the sensor is within operating range again.
FAULT 14 = CH supply sensor 2 (High Limit sensor) out of normal operating range (short circuit or open circuit). If sensor
goes outside the range , error will be generated. In case sensor is back to the normal operating range, error is
gone. In error mode, heat demands will be disabled. In case 2 or more sensors are broken, controller will pick
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operating range again.
FAULT 15 = Blower driving problem – in case of new burner request the fan is switched on: if the controller measured a
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case speed is back to the normal operating range, error is gone. In error mode, heat demands will be disabled.
Resolving situation can be achieved only if the speed is within operating range again.
FAULT 20 = Warning – The water pressure, measured by the water pressure sensor, is higher than the low level and lower
than the nominal level. This is only an indication, the heat request is not switched off.
FAULT 21 = Warning – The water pressure, measured by the water pressure sensor, is higher than the high level –4.3 psi
and lower than the high level. This is only an indication, the heat request is not switched off but there is a linear
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maximum output is equal to Blower absolute minimum speed + 20Hz.
FAULT 27 = With the PVC/CPVC selection parameter equal to:
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perature is still upper than the PVC maximum temperature, the controller stops indicating fault 27, where it
will stay for 5 minutes. The error solves itself after 5 minutes.
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perature is still upper than the CPVC maximum temperature, the controller stops indicating fault 27, where
it will stay for 5 minutes. The error solves itself after 5 minutes.
FAULT 34 = Low voltage (less than 100VAC) will trigger this error. This is only an indication, the heat request is not switched off.
When voltage brought is back (over 100VAC), error is resolved. (more than 1 pump wired to pump connection point).
FAULT 35 = The controller measures a voltage supply frequency different from the voltage supply frequency pa-
rameter. This is only an indication, the heat request is not switched off. When the controller will mea-
sure a voltage supply frequency equal to the Voltage supply frequency parameter, error will be resolved.
(Example 60 Hz).
92
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ALL OUNT GAS FIRED WATER BOILER
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Boiler Manual
(continued)
Condition
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Part number 550-100-305/0118