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Fortunately happened upon your website via a google search and am hopeful that you can relay some advice/input for my situation. I have been experiencing the constantly running fan syndrome (immediate ON and with heat) for the past week. Thinking this might have been due to a faulty T-stat, I opted to replace the original Robertshaw D 34000 with a newer Honeywell RTH221B (programmable). Simple two wire hookup but no change/response to any of the T-stat programs. The furnace is a Coleman model # 3120B751 in a late 70's mobile home. Currently shutting the system off via the breaker. I've done an archive search here but nothing specific to my model. Relays or switches? Appreciate your help/advice...
Sorry about being slow to answer. When your blower runs, do you also get a little bit of heat with it? If so, replace your sequencer. Part number 3120A3571. Another issue could be your relay, part number 3115A3301. Parts can be ordered here: http://www.mobilehomerepair.com/ColemanElec.html
Thanks for that info Mark. Actually have a couple of additional questions please.Seems like the heat is around 70-72 and actually becomes fairly warm shortly afterwards, make sense? At any rate are both the sequencer and relay fairly accesible and would it be best to do the r/r of the sequencer before the relay...
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