My brivis heater has stopped working. err msg 71 HI

Sandy requested 2 quotes from Heating Professionals in Richardson

brivis ducted gas heater has stopped working and comes up with error no 71 HI. Heater is in the roof

Replacement transformer and fit for a Vulcan wall heater, Quasar 40 W/F
I have had the heater looked at already as there was a humming noise coming...

Vulcan Central Heating Combustion Air Pressure System failure
heating - fixing problem: Vulcan Central Heating Combustion Air Pressure...

Vulcan heritage gas heater, 15 years old. auto programme control faulty.
the auto programme control is faulty and the fan has stopped working....

Brivis gas ducted heating not working (in roof)
it is my mothers house she is 83 and not well, the heater would not turn on...