Motherwell boss Mark McGhee has called for a full investigation of the Fir Park under-soil heating system after his side's game with Hearts was postponed due to a frozen pitch.
"I want answers," McGhee told BBC Sport. "If there was some sort of failing, I want to know it's been fixed immediately.
"The system was repaired and checked after it had been damaged. We took the extra precaution of bringing in covers at some expense."
He added: "It is only an area within the six-yard box that I believe has really put the game off, but it's enough to be a danger to the goalkeeper and therefore the game is off.
"The boilers for the heating are all showing full power and it had been tested previously. All the tests showed that it was working and, with the extra covers going down on top of that as well, we can't explain it.
"I want to know that, if there is a problem with it, we have sufficient cover that we can put on the pitch that will guarantee that nothing like this happens again this season. It's a joke.
"It's doing my head in. It's the first bit of inclement weather."