Common problems guide

The most common Firebird Popular Heatpac problems

The faults most likely to send a Firebird Popular Heatpac into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
4 documented codes
4 most common
4 DIY-safe checks
0 engineer needed

The 4 most common faults

01
Lock-out lamp High DIY-safe

Your boiler has shut down to protect itself and needs to be manually restarted because the burner has failed to light.

What to try first

Wait for at least 60 seconds after the boiler has stopped.Locate the red reset button on the burner control box.Press the reset button once to attempt a restart.Check that you have sufficient heating oil in your tank.

Est. cost
£100-250
Parts
Oil nozzles, Photocell, Oil pump
Full guide for Lock-out lamp
02
lock-out High DIY-safe

Your boiler's burner has shut itself down because it is struggling to draw fuel, likely due to air or debris blocking the internal pump.

What to try first

Locate the red reset button on the burner control boxPress the button once to see if the burner restartsCheck that you have sufficient heating oil in your storage tank

Est. cost
£120-280
Parts
Oil pump, Oil nozzle, Oil filter element
Full guide for lock-out
03
RED light High DIY-safe

Your boiler's burner has shut down for safety because it couldn't light properly or lost its flame during operation.

What to try first

Check that you have enough heating oil in your storage tank.Ensure the oil supply valves are fully open.Press the illuminated red reset button on the burner control box once.

Est. cost
£100-250
Parts
Oil nozzle, Photo-electric cell, Oil pump
Full guide for RED light
04
Overheat High DIY-safe

Your boiler has become too hot and has automatically shut down for safety.

What to try first

Wait for the boiler to cool down completely.Unscrew the black plastic cap on the control panel to reveal the reset button.Press the manual reset button firmly and replace the cap.Ensure your radiator valves are open and the system pressure is correct.

Est. cost
£90-180
Parts
Overheat Thermostat, Circulating Pump, Thermistor
Full guide for Overheat

on the Firebird Popular Heatpac

Oil nozzlesPhotocellOil pumpIgnition transformerOil nozzleOil filter element

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Firebird shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue
See the full 4-code list for the Firebird Popular Heatpac