Error E193

Safety precautions:

1) If you smell gas, do not attempt any checks—leave the property immediately and call the gas emergency number. 2) Before touching the boiler controls turn the boiler off at the normal control and switch off the electrical supply at the fused spur or consumer unit if you need to access anything. 3) Do not remove sealed covers, work on gas pipes or internal electrical components yourself. If in doubt, stop and call a Gas Safe engineer.

Initial checks a homeowner can do:

1) Note the exact display and any lockout lights. Try one boiler reset only: if your model has a reset button or an R position on the selector, hold for about 5 seconds and release (refer to the manual). Do not repeatedly reset more than 2–3 times. 2) Check system pressure on the boiler display or gauge. Typical working pressure is around 1–1.5 bar when cold. If pressure is below 0.5–0.7 bar the boiler may lock out; you can top up the system using the filling loop according to the boiler handbook, then close the filling loop and re-test. 3) Check radiators and valves: ensure radiator thermostatic valves and lockshield/service isolation valves are open. Bleed radiators to remove trapped air which can cause circulation problems. 4) Listen and feel: when heating is called for, listen for the pump running (a low whirr or vibration). Carefully feel the flow and return pipework at the boiler or the first radiator – after the pump runs the flow pipe should get warmer than the return.

Specific diagnostic and sensible fixes to try (homeowner level):

1) If pressure is low, top up via the filling loop (follow manual) and re-check whether the fault clears after a reset. 2) Bleed one or two radiators to remove air pockets, then re-pressurise if needed and reset the boiler. 3) Check that any external/inline isolating/service valves on the pump or boiler flow and return are fully open (these are usually small round or lever valves near the pipework). 4) If the pump makes no noise at all when heating is called for and you are confident the boiler has power, record this and do not try to force or dismantle the pump; this points to pump electrical failure or wiring and needs an engineer.

When to call a professional and what information to give them:

1) Call a Gas Safe registered heating engineer if the above checks do not clear the E193 error, if you cannot safely perform the checks, if the pump appears dead or noisy, or if you suspect a blocked heat exchanger or internal fault. 2) When you call, tell the engineer the exact error code (E193), the boiler model (Baxi Platinum), what you have already tried (reset, pressure checked, radiators bled, valves checked), any noises you heard, and whether hot water as well as heating is affected. 3) The engineer will be able to test pump electrical supply, check/clean or replace the pump, inspect for blockages or scale in the heat exchanger, check flow/pressure sensors and the diverter valve, purge the system or perform a powerflush if required, and test controls and PCB wiring.

Final notes:

Do not attempt gas or internal electrical repairs yourself. E193 is a protection measure to prevent damage; persistent attempts to reset without diagnosing and fixing the circulation fault can cause further damage. If the fault returns after simple homeowner checks, arrange a Gas Safe engineer to properly diagnose and repair the underlying cause.