On a new installation this usually indicates that the unit has been incorrectly wired so please read the instructions supplied carefully and ensure that the unit has a separate live supply to the fan. This allows the fan to start the pre purge process and allow the boiler/water heater to ignite once the pressure switch makes contact.

Do not put the switch live with the permanent live as this sends a continuous feed to the relays and prevents the post purge from taking place. It also damages the relays after a while which results in early failure of the pcb.

Fault Checklist

• Check that the unit is correctly wired
• Turn up the fan speed (350/800 models only)
• Check for flue blockage by performing a spillage test
• Check airflow pressure on the ports using a micro manometer
• The pressure switch could be blocked with moisture so try cleaning the tubes
• Blow down the positive (+)port and listen to determine that the switch is making & closing contact
• Try adjusting the switch anti clockwise no more than one full turn
• Check the fuses on the circuit board (350/800 models only)

Check fuses are ok – 5 amp maximum.
Isolate the fan supply and check if the motor can be moved freely – motor bearings may have seized.

Yes although we cannot offer a guarantee if this is not factory fitted. Our fans are designed so that the inner control tray can be removed as a sub assembly and returned to us for assessment and repair; a quotation would be supplied prior to carrying out any work.

Note: We do not offer this service for units over 5 years old. Replacement parts fitted by Flueboost carry a 12 month warranty.

Yes providing the product is returned within 14 days of purchase and in the original packaging we will re-stock subject to a 20% re-stocking charge.

The fan can be used but low voltage relays need to be installed to reduce the voltage from 240 to 12-24v then back up again.

Although our fans can run for 24 hours a day we do not recommend this as it will decrease the life expectancy of the unit. The motor bearings and windings should ideally have a cooling down period to prevent them overheating and burning out. Ideally the unit should be integrated into a time clock, thermostat or BMS as shown on the instructions supplied with the fan.

NOTE: If your boiler transformer or control is faulty or broken it will blow the new board so ensure these are fully tested beforehand.

Before installation of a new board check that the fan motor is not faulty by connecting a 240v live and neutral through the incoming mains and testing that the motor starts. If it doesn't start, do not install the new PCB as a faulty motor will cause the new board to blow. Please contact Flueboost for advice.

Checklist for fitting a new PCB
After ensuring the instructions above have been adhered to take the following steps:

• Disconnect switch live to boiler supply cable on the 350/800 models)
• Turn on and put multi meters on the boiler live supply cable
• Bring a neutral in from the incoming mains to determine that there is a 240v supply out after the 30-50 second pre-purge has elapsed
• Turn off then reconnect the switch live feed back to the boiler
• Check boiler/gas valve isn't faulty before reconnecting

• Isolate the fan supply
• Disconnect the lead (350/800 series only)
• Remove the inner sub assembly as shown below
• Clean the fan blade using either a soft brush or ideally an air compressor

Do not lubricate the fan motor as it has sealed for life bearings.

NOTE: Take care not to cause imbalance when cleaning the main impeller.

Please note, do not attempt any maintenance work on any electrical appliance unless you are a fully qualified electrician.