Weil-McLain Aqua Balance WMB-155 Manual page 93

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AquaBalance
34 Troubleshooting
Figure 117 Troubleshooting suggestions — Fault displays and diagnostics
Display
FAULT 37 = Low water pressure error can be caused by the low water pressure in the central heating system. This can be
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seconds). In error mode, the heat demand and the pumps are switched off. See Pressure supervision of the
central heating installation paragraph.
FAULT 39 = Outside sensor out of normal operating range (short circuit or open circuit). If sensor goes in short circuit and this
condition lasts for more than 10 seconds, error is generated. In case sensor is back to the normal operating range,
error is gone. Normal operating range for the outside sensor is from -22°F till +158°F. With sensor broken in a way
that he makes an open circuit, error will be generated only if a curve is selected: OTC will be disabled but heating
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operating range. Resolving error situation can be achieved only if the sensors is within operating range again.
FAULT 40 = High water pressure error, caused by the water pressure sensor. Water pressure is higher than high level (with
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supervision of the central heating installation paragraph.
FAULT 43 = If the slope temperature felt by the CH supply sensor is greater of Heat exchanger protection parameter, a fault
is generated due to the lack of water of the system. When the temperature felt by the CH supply sensor goes
down under the 113°F, the boiler comes back into the normal operation. Each CH or Installer Test mode demand
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FAULT 47 = Water pressure sensor not connected. In error mode, the heat demand and the pumps are switched off.
Resolving error situation can be achieved only if the sensor is connected again.
FAULT 50 = Variable input switch contact opened. See Variable input switch paragraph.
FAULT 51 = Low water cutoff sensor open. This error can occur only when the Variable input switch functionality parameter is
set to 3. This is only an indication, the heat request is not switched off.
FAULT 52 = When the system measures a difference between two CH supply water temperature sensors equal or higher than
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get to the normal operation again, the temperature between the two CH supply water temperature sensors has to
be lower than 14°F for 10 seconds. When this timer is expired, error will be resolved.
FAULT 53 = High limit thermostat open. This error can occur only when the Variable input switch functionality parameter is set
to 4. During fault the boiler is forced in stand-by mode. Blue jumper wire missing on Heating Only boiler.
FAULT 64 = 5 MicroCom reset in 15 minutes time frame. This error condition is stopping the boiler and to get to the normal
operation again, it is necessary to take out main power supply.
FAULT 66 = Software doesn't match. This error condition is stopping the boiler and to get to the normal operation again, it is
necessary to re-program the device or to replace it.
Part number 550-100-305/0118
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ALL OUNT GAS FIRED WATER BOILER
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Boiler Manual
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Condition
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