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Type: Posts; User: jsmith777
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I replaced the control board, though it wasn't cheap ~$180.
The furnace has worked perfectly since.
Since the furnace would work fine sometimes, I believe a bad relay or relays on the control...
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This older style HeatCraft board does not have any Diagnostic LEDs :(
Last night it actually ran fine but all the while the control board was clicking incessantly as the main blower was running....
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Neutral to ground = 0
hot to ground =120V
hot to neutral = 120V
Jumpered R to W for the thermostat, but the problem was not corrected.
Inspected all the solder joints and nothing appears out...
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Same thing happened again a few hours later.
Clicking noise from board as main blower starts, but flame and blowers are going full.
After a few repeated attempts, the clicking noise from the...
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I cleaned the flame sensor and then re-started the furnace. At this point, the control board clicked incessantly after the thermostat kicked on and the inducer motor would not fully start, no...
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We have a Armstrong Ultra Sx80 furnace, model GUJ050D10-3A, with a HeatCraft Control Board, cat number 70k98 (40403001).
Everything fires up fine… thermostat, inducer motor/fan starts, then...
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