Meiko UK has created a seven-point dishwasher hygiene checklist for reopening safely, which includes checks for Legionnaire's disease.
"Dishwashers may have not been used for months and there is a risk that some will still be full of stagnant water," said Meiko UK technical services director Dave Kemp.
"Heat pumps on any dishwasher can act as a reservoir for disease, so it is vital that caterers check their machines now, before opening.
"Dishwash hygiene relies on a combination of dishwash mechanics, temperature and chemicals. All three elements must be working in harmony to achieve sanitisation."
To view the full checklist click here.