Mobile home furnace. Furnace was blowing cold air. Low flame error code. Ignitor changed and it helped a little, still pretty cold. No error codes. Called Zenner & Ritter to fix. Greg M. checked gas pressure at 2 ports, pressure fine. Took gas valve apart, spider and nest inside. $89 service call plus first half hour of diagnostics. Charged $120 total for about 50 minutes of work. Not bad considering professionalism, most companies I called won't work on mobile home furnaces (one guy didn't show up, one came and wouldn't work, some declined over phone), and a tricky fix taking apart the gas valve. Spiders may be attracted to gas, lesson learned.
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