Transformer was making a loud buzzing noise that they wanted to replace. I replaced it with a 40 VA transformer turned on the power and within 30 seconds the transformer burnt up. Got another transformer that has a fuse on it and installed that. found the system would not fire. I have 24 V coming from the pump control to the gas valve control. But I don’t have anything coming out going to the gas valve. Tested resistance on the gas valve and I get open readings on pilot valve and main valve. My thinking is that the gas valve shorted out taking out the Gas valve control. These will have to be replaced.