Spent the last couple of evenings searching internet for replacemen
parts, which helped me identify the parts on my G24M furnace. I als found my circuit/control board has the updated 6K07 control board. Rea through my Lennox G24M Installation Instructions and User's Informatio Manual to obtain a better understanding of the system and components Local dealer was willing to sell me a new control board for $260 and found them for $252 and $258 on the net. Decided to wait until I coul spend more time troubleshooting the system.
Finally had time today to troubleshoot my system. Removed panel, wif switched thermostat to "heat" and I found out a lot.
- induction blower was working properly (thanks to Bubba I know it' name)
- almost immediately the clicking started (nothing should happen fo the first 45 seconds, except for the pressure switch to send power t board ignition control, when board ignition control receives powe signal from pressure switch it starts a 45 second delay, at the end o delay the board ignition control will send power to spark ignitor an gas valve solenoid)
- clicking wasn't spark ignitors, but was the gas valve solenoid, ga valve shouldn't receive power for 45 seconds
- turned off all power, turned gas valve manual control knob to off removed ignitor/sensor/tube assembly to confirm ignitor type, it ha two prongs at one end (spark ignition) and one prong at other en (flame sensor?)
- reinstalled ignitor/sensor/tube assembly and turned gas knob on
- turned power back "on" and called for "heat" again, gas valv started clicking again within 2 seconds after blower started
- removed vacuum hose from blower and clicking stopped, which prove diaphragm pressure switch was working (considered turning off power an ohming through switch while manualy applying vac/press into tube bu decided my wife would think I was nuts)
- reconnected vacuum hose to blower, diaphragm pressure switch sen power to control board ignition control circuit, which sent power t gas valve again without waiting the required 45 seconds
- realized something within the control board ignition control circui wasn't working properly, turned off power and gas valve
- searched numerous forums looking for G24M and 65K07 information
- one mentioned replacing or cutting off black cover from the ga control relay and cleaning the contacts, which is on the control boar next to the 15 pin connector
- another one mentioned checking ground wire connections
- I decided to remove and reseat all plugs and wire connectors o board
- I then tilted board away from top two plastic retainers an inspected the back of it for burnt/black spots
- Lastly I "lightly" tapped on board relays
- turned power and gas knob "on"
- called for heat, induction blower started, approximately 45 second later the gas valve opened and spark ignitor lit
- selected cool, compressor came on and a/c worked
- selected heat, furnace worked
- selected off and selected fan "on", fan worked
- selected heat and continued to play with thermostat settings t turn off need for heat and then to call for heat
- furnance continued to work
Hopefully my system will continue to work. Considering the low cost o some replacement parts, I've decided it would be wise to keep some o hand. I'm planning to order the following: Furnace - flame rollout sw, primary and secondary switchs, pressure sw blower motor capacitor Compressor - comp time delay 1 minute, 24v double pole 30 amp relay capacitors 35W comp and 5W fan 440V
Thanks for all y'alls help with fixing my system, tripnt
-- tripntx