Take the boiler's obs
A ward chart scores a patient's vital signs so the nurse knows when to call the doctor. This does the same for a boiler: five readings, three bands, and a message to Mark written for you.
Boiler obs
Tap what you can see. Skip anything you're not sure of.
HeatingRadiators
Hot waterAt the tap
Gauge, bar
DisplayLights, code
Leaks, noiseLook, listen
No readings yet. Start with the radiators and the hot tap. The pressure gauge is usually on the front or underneath the boiler.
Boiler not right? Ring Mark.
Tell him what the boiler is doing and any code on the display. If you're not sure, take its obs first and the message writes itself.
8am to 8pm, every day