1 A bit of effort required to keep Koba back from the fries.
2 OK bud
3 This is what the branding says on the outside of the furnace we are about to repair.
4 R C Y G W
5 A few wires to account for.
6 The audit begins so all wires can be reconnected in the right places.
7
8
9 Wasn't sure if these were all coming out, or getting everything, so it was time for excess.
10 Model L1RA 072N - 12A. Make a note of it.
11 This is super useful for cross referencing the diagrams that come with the replacement board. This is an 80+ furnace, btw.
12 Verify, verify, verify.
13 Surveying the destination of all the wires as well so as to make sure they meet the labeling on the diagrams.
14
15
16
17 There's a configurable jumper there, so document that too.
18
19
20
21
22
23
24
25
26 There's the flame sensor that just got replaced.
27
28
29
30
31
32 Best use case for a magnetic base flashlight yet.
33 Blue and yellow wire weres added for the AC, so the board can also control the fan when the AC is on.
34 Everything looking good so far. That odd jumper wire will indeed transfer to the new board. As well as the black push-through spacers.
35 Confidence is high.
36 New board mounted on old stand-offs with no modification. No wiring mods required. Just unplug old and plug in new. Nice.
37 Working in an order that seems easy to avoid entanglement.
38
39
40 All hooked up.
41 Flip the switch to send power to the board!
42 No explosions! And a power indicator light. All good. Let's go ask for heat at the thermostat.
43 It took a minute or two longer than expected to start up, but went through all safety checks OK and fired up and kept running until the thermostat said no more.
44 Button up.
45 Toasty air coming out of the vents. Thank you and good night.
