Weil McLain F4 Error Code
MSB OT room setpoint °F °F Int OpenTherm 19 20 CL4 - FAF4 LSB CL4 - FAC8 MSB OT
Source: ab-80c__wml-aquabalance-series-2-iom.pdf
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Other Weil McLain Error Codes
prom parameters Unit Range Def Description Num. Address Description Low High Val
Firmwareversion Num 0 99 04
repeated 3 times in the last 24 hours LP Liquefied Petroleum (Propane) Gas LWCO
repeated 3 times in the last hour A41 Temperature sensor not or bad connected to
generated for 1 hour (con- secutive) See fault F15 A06 No flame after igni- tion
Supply sensor 1 fault Sensor damaged Wiring shorted Check the wiring or replace
Return sensor fault Sensor damaged Wiring shorted Check the wiring or replace th
DHW sensor fault Sensor damaged Wiring shorted Check the wiring or replace the s
the temperature display. The meaning of the error numbers are as follow: Table 3
Abbrevia- Description tion A01 No burner ignition after five attempts ADC Analog
Condition Correction A01 No burner ignition No gas Check the regular gas flow to
flashing (history/fault) ·Push “Reset" once · Push + to scroll error codes, refe