The 24-year-old former AFC Whitehall, Sun Inn and Brighouse Sports player decided he would take a quick comfort break ahead of going out with his team last Sunday. Once he had completed the task he was horrified to find that the dressing room complex door had been locked with him still inside.
Ash banged on the door and shouted out at the New College venue in Salendine Nook, Huddersfield, but nobody came to his rescue.
"I sat on the step for a bit behind the door and then went back into the dressing room to get by a radiator to keep warm," he said.
"I couldn't even use my mobile phone as that was in the valuables bag with a club official, so I was snookered.
"Then the door suddenly burst open and our goalkeeper-manager Peter Jennings and a sub came in laughing their heads off.
"More suddenly appeared behind them including the referee who had stopped the game after 10 minutes when they had realised I wasn't on the field!
"How on earth they didn't realise for that length of time they were only playing with 10 men, I have still to find out."
The former Hipperholme and Lightcliffe HS student who is now a lab technician at Interfaceflor, Shelf, says he has already taken a lot of "stick" both verbally and via texts to his mobile telephone.
And he has vowed that in future he will make sure he pops to the loo well before the manager chases the players out of the warm dressing rooms.