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Buderus GB142 DHW not working
OK, this is a system that was installed in 2005. There are 5 zones all run by Argo switching unit plus there is a DHW circuit. It's been running fine till the propane supplier let them run out of fuel. The homeowner noticed what he thought was a pop when it tried to ignite while it was out of fuel. They called another technition and he determined that the plastic cover on the top of the boiler was jumping when it tried to fire. This happened even after the gas company filled the tanks. So his fix was to just take the cover off. I'm not sure what else he did, but I think he reset the incoming gas pressure to 11. However the next day the homeowner noticed that he had no DHW. That's where I come in. I tested for power to the circulator and found that it had none. then I replaced the DHW tank sensor thinking the old one may have gone bad. I still have nothing going on the DHW side. The heating circuit is working fine. I've tested the resistance on both the old and new sensors and the are virtually identical at room temp and when put in a glass of cold water. Also I checked the fuses and they are fine.