Not every heat pump issue needs an engineer visit. A handful of simple checks can either resolve the problem outright or help whoever you do call diagnose it much faster.

Check the Basics First

Confirm the system has power, the controller display is on, and no breakers have tripped. It sounds obvious, but a surprising number of "no heating" callouts come down to something this simple.

Check the Mode and Schedule

Make sure the system isn't accidentally set to "hot water only," "holiday mode," or a schedule that doesn't match what you expect. These settings are easy to change by mistake and just as easy to overlook.

Check the Pressure Gauge

Most systems display a pressure reading on the unit or controller. If it's noticeably low, this can explain reduced performance or lockouts, and it's worth noting the exact figure before anyone attends.

Note Any Fault Codes and When They Appear

Write down the exact code, what the system was doing when it appeared, and whether it's happened before. This context is often more useful to a diagnosis than the code itself.

Check External Unit Clearance

Make sure the outdoor unit isn't blocked by snow, leaves, or debris, and that airflow around it hasn't been restricted by nearby storage, planting, or fencing.

Think About Timing

Did the issue start after a power cut, a settings change, or particular weather? Identifying what changed right before the problem began often points directly to the cause.

When It's Time to Get Help

If the basics check out and the issue persists, that's the point to bring in an independent opinion, particularly if you've already been told "everything's fine" but it doesn't feel right. Going in with clear notes on what you've already checked makes any review faster and more accurate.