York Gas Furnace: YM9M / PM9 / YP96 / PC9 Re: Sequence of Operation (Heating) There are two styles of York Modulating Gas Furnaces, a Variable Speed Blower model and a standard PSC motor. Both styles have the same basic sequence of operation in the heating mode Pressure Switch Proving ...

York Gas Furnace: YP9C Re: Airflow Settings The YP9C gas furnace is a Modulating, Variable Speed furnace. The Hi & Lo cooling airflow (CFM) can be adjusted with pin settings on the control board. 060B12 080B12 Taps Hi Cool Lo Cool Hi Cool Lo Cool COOL ADJ ...

York Gas Furnace: YP9C Re: Test Mode During normal operation, the furnace input rate can vary between 35% and 100% of full nameplate input, making it difficult to check for proper operation. To help with the furnace startup and servicing, the control has a TEST MODE available that allows...

York Gas Furnace Re: Water Leak / Clear Condensate Pan Covers All of the 33" gas furnaces originally came with a clear, plastic condensate pan cover. Over time, the clear plastic pan has a tendency to crack and cause condensate leakage inside the furnace cabinet. Any clear condensate pans...

Gas Furnace Re: Blown Low Voltage Fuse The low voltage fuse provides protection for the control board and other low voltage components in the case of high amperage caused by a low voltage short or excess component load. ► The fuse must be sized per the "VA" of the transformer. Amps = VA...

York Gas Furnace: YP9C Re: Blowing SSU Fuse / Tripping Breaker The furnace either blows the SSU high voltage fuse or trips the breaker when power is applied. Qty Possible Causes: 2 Bad Blower Motor Bad Control Board Shorted High Voltage Wires Bad...

York Gas Furnace: YP9C Re: Noisy Blower (Heating) The YP9C gas furnace has a modulating gas valve, variable speed inducer and variable speed blower motor. Qty Possible Causes: Bad Blower Motor Bad Blower Wheel 1 Clogged Air Filter CHECKOUT: 1....

York Gas Furnaces: YP9C Re: Diagnostic/Fault Codes These York modulating gas furnaces have a control board inside the furnace blower compartment that will flash a diagnostic code that shows the operating status of the furnace. Diagnostic Codes: 1 Green Normal Operation - no...

York 90% Gas Furnace: YP9C Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. ►The code description on the blower door may say, "Vent or Termination Problem" which is a possible cause, but not the most likely. This gas furnace has two pressure...

York 97% Modulating Gas Furnace: YP9C Re: Flashing Code 5 Flashing Code 5 = Rollout Switch or Condensate Pressure Switch The rollout switches and the condensate pressure switch are wired in series, so either switch opening during a call for heat will cause a Code 5. Qty Possible...