Vulcan HX100 Ducted Heater Error code 3 combustion air pressure system failure. any suggestion.

You can check the wiring but this looks like an incompatible controller. Here are some alternatives:

If you're looking to purchase an Evaporative Cooler Vulcan Touchpad Controller, there are several options available. Here are some places where you can buy one:

The Home Depot: You can purchase a DIAL Evaporative Cooler Digital Controller from The Home Depot for $64.48.
Gasstop: Gasstop offers a refurbished wired Bonaire Comfort Control remote that works with Bonaire and Vulcan gas central heating systems for $150.
Bonaire Heating & Cooling: Bonaire offers a range of Navigator Remote Controls for Cooler and Heater, including My Climate® Wi-Fi® for ducted evaporative cooler, ducted gas heater, or dual-cycle air conditioner.

Navigator Remote Control for Cooler and Heater (bonaire.com.au)

First I would check the flame sensor is clean and the connections are all tight . Then check out the pressure switch.

has the system air filters been serviced lately
is the system circulation fab been cleaned to allow full air circulation of the system
call in a technician to check for vermin infestation preventing the system from working properly

Hi Vulcan Bonaire,

Is this a ducted gas heater or a free standing gas heater???

You have to recode the remote to the heater if the batteries have been removed for more than 3 minutes. On the comfort control will the remote is in a off state turn the heater off at the power.

While off press and hold the up button and the on/off until code appears then release buttons and turn the power back on to the heater.

When code disappears from the remote turn on the remote set the temp higher than current temp and combustion fan should start up then heater will fire up.

If not repeat process as they are easily corrupted by other remotes.

Download control manual from - http://www.bonaire.com.au/support/documentation/owner/default.aspx

Set / check fan speed or it may overheat.

Check the exhaust and air intake for any blockage or sag that may hold some water in it. Also check the condensate hoses for any blockage. You may also want to check the small hose that goes to the pressure switch for moisture. You could also have a bad or weak combustion fan not pulling in the pressure switch.

Gas ducted central heater won't switch on all of a sudden

The error code refers to a defective combustion air switch. Coleman Evcons made around 2007 had defective pressure switches or as they call them "combustion air switch". Replace it and the problem is gone.

• We had the same problem with our carrier heater 4 year or so ago. We had a technician and electrician try to resolve the problem. What the tech suggest was to replace the main component board to the heater and update it as well. haven't had any troubles with it. cost was $450.