Four blink status lights errors are caused by a failure to maintain an electrical circuit through the room sensing probe. If the probe is not connected to the stove, if a crimped wire connection on the room sensing probe is faulty or if the sensing probe wire or resistor at the end of the wire is damaged, the stove will immediately display the 4 blink error code when the stove is attempted to be used on “Room Temp” mode. If you get this error code please note that you can still use the stove on the “Stove Temp” or “Constant Burn” mode, however; the stove will not turn off and on or modulate up or down as the desired room temperature is reached.
If the room sensing probe is plugged in and you get this error, replace the room sensing probe.
Accetra Inserts (Excluding the Accentra 52i) and the P35i require the installing technician to cut the ¼” factory crimped wire connections from the ESP probe and install 1/8” connections supplied in the installation kit. It’s very common for installers to use pliers to make these crimped connections instead of actual crimpers and sometimes the wires will slip out of the connections if the proper tools weren’t used. If this is the case, simply install new connectors.
All Harman Pellet Stoves are designed to monitor the room temperature in the “Room Temp” mode using this room sensing probe, however; it is possible to connect a simple heat only wall thermostat to the stove using the room sensing probe connections, with the probe itself being wired in series with the thermostat. This is a “customized” approach that isn’t really supported by Harman but was at one time.
Harman stoves that are used in this way will keep the temp dial on the stove turned all the way up to 95 degrees and used the wall thermostat to “clip” the signal or disconnect the sensing probe from the controller. When this happens, the controller will immediately go into a 4 blink error and the stove will shut down. When the thermostat call for heat again, the circuit will be restored and the stove will start up or recover and continue to run normally until the thermostat is satisfied again. We just thought we’d toss that out there in the event that your stove was configured in this way. If it is, and it’s still not working, it’s possible the probe is malfunctioning and as such…the thermostat function will not work either. We’d suggest ditching the thermostat at just install a new probe without the thermostat.