Weil-McLain Aqua Balance WMB-155 Manual page 91

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AquaBalance
34 Troubleshooting
Figure 115 Troubleshooting suggestions — Fault displays and diagnostics
Blocking codes
The boiler controller recognizes also the fault situations that can block the heat demands but do not lead to lockout condition.
When the error condition becomes resolved, error will disappear but will be also written into the history data. If this is the case,
there is also an "F" on the status display. Temperature display gives an error code. The meaning of the code is as follow:
Table 4
"F" lockout codes
Error code Description
F07 The Exhaust gases temperature is too high.
F10 The CH supply water temperature sensor 1 error.
F11 The CH return water temperature sensor error.
F12 The DHW water temperature sensor error.
F13 The Exhaust gases temperature sensor error.
F14 The CH supply water temperature sensor 2 error.
F15 Minimum and maximum frequency feedback from fan error.
F20 The water pressure in the CH installation is near the low level.
F21 The water pressure in the CH installation is near the high level.
F27 The exhaust gas temperature is too high (PVC/CPVC selection).
F34 Low mains voltage.
F35 Frequency error.
F37 The water pressure in the CH installation is too low.
F39 Outside sensor error.
F40 The water pressure in the CH installation is too high or there's a Control fault.
F43 Heat exchanger protection.
F47 Water pressure sensor not connected.
F50 Variable input switch contact opened.
F51 Low water error.
F52 Too high difference between two CH supply water temperature sensors.
F53 High limit thermostat input error.
F64 5 MicroCom reset in 15 minutes time frame.
F66 Software doesn't match.
Display
FAULT 07 = If the exhaust gases temperature becomes higher than Maximum exhaust gases temperature and the high tem-
perature is present longer than 5 seconds, controller will stop indicating fault 7, where he will stay for 15 minute.
If the exhaust temperature is within normal levels after this time expired, error 7 will be resolved by itself.
FAULT 10 = CH supply sensor 1 (Supply Temp 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.
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
91