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<http://schema.org/description>
"I first called for the 29.00 special diagnostic. The service men were on time. They were polite and put on booties before entering. I explained the problem. They easily understood. They checked the heater and within 30 minutes found the problem, cont.Troubleshooting heating system (diagnostic)Supply and install high limit switch"
<https://www.greenhvacair.com/residential/indoor-air-quality/>