Label each reading with the compartment, unit, time and measurement location. Write targets separately from independent measurements.
What the observation tells you
A note containing only '4 and 18' omits the minus sign and can confuse the meaning. It also fails to show whether the values were selected settings or observations. Recent door opening and fresh loading should be recorded where relevant.
A useful next step
Use a simple consistent format and preserve the original readings. Send the concise record with the model and symptoms rather than converting uncertain values into a confident diagnosis.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.