Our stove suddenly began to emit high CO readings (NB: don't have a CO detector? GET ONE IT CAN SAVE YOUR LIFE). Fire dept. came, called Enbridge, the stove was red tagged and gas turned off. Big problem! But John from Sarman Air Inc. came really quickly and fixed the problem. He was able to just clean out the burner, and hence we saved a lot of money because we didn't need to buy expensive new parts. We were very pleased with his service.