High
E193 on Potterton Promax System ErP

Your boiler has sensed that water is not circulating properly before the burner ignites, often due to trapped air or a blockage.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Pre-Circulation Fault

Shared across the Promax range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like E193: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

E110View →E125View →

All 9 fault codes on the Promax System ErP

Seeing a different code? Every code this model can display, in one place.

E20E28E110E119E125E130E133E160

Related guides you might find useful

How to bleed a radiator

Quarter turn on the valve, wait for water, then check the boiler pressure.

Read →

Radiator not heating up

One cold radiator is usually a stuck valve pin or trapped air.

Read →

Banging, kettling or whistling noise

Each noise points to a different fault.

Read →