The public is being urged to make sure their tumble dryers are being used safely.
North Wales Fire and Rescue Service said it responded to two fires involving tumble dryers in 24 hours.
Fire crews responded to a fire in an outhouse in Caernarfon at 2.06am on Tuesday.
They then responded to another fire involving a tumble dryer in Mynytho at 4.51pm.
The fire service said severe damage was caused to the house in Mynytho.
This brings the total number of fires involving tumble dryers in the North Wales region since 28 February to six.
A fire in Broughton damaged two properties on 25 March, with further fires involving tumble dryers in Denbigh on 6 March, Buckley on 3 March and Ruthin on 28 February.
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Paul Kay, head of fire safety for the service said “a fire can be devastating for all involved”.
“No trend had been identified as yet with make/models – the most important thing is for all residents to follow our safety advice when using all tumble dryers,” he said.
“We’re undertaking an internal review of all incidents to better understand if there is any correlation.”