Carrier furnaces, 33/13 error codes, tried some stuff, stuck
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Carrier furnaces, 33/13 error codes, tried some stuff, stuck
Hi, I have two Carrier Weathermaker 8000 furnaces. Neither will ignite. In both cases, I replaced very dirty filters with clean ones.
Furnace #1 - 58WAV070-F-16112 66,000 BTU, 3-Burner, 80% AFUE
Unit turns on, draft inducer starts running with no code; eventually a code 13 shows, then blower motor comes on. replaced the hot surface ignitor, removed and cleaned the limit switch (there is no rolloff switch on these furnaces). Still not working.
Furnace #2 - 58WAV045 44,000 BTU, 2-Burner, 80% AFUE
Unit turns on, immediately the blower motor comes on, 33 code shows immediately, then ultimately a 13 code. replaced the hot surface ignitor (previous one crumbled), blower motor is a little squeaky but was running successfully with squeaks for a long time.
Furnace #1 - 58WAV070-F-16112 66,000 BTU, 3-Burner, 80% AFUE
Unit turns on, draft inducer starts running with no code; eventually a code 13 shows, then blower motor comes on. replaced the hot surface ignitor, removed and cleaned the limit switch (there is no rolloff switch on these furnaces). Still not working.
Furnace #2 - 58WAV045 44,000 BTU, 2-Burner, 80% AFUE
Unit turns on, immediately the blower motor comes on, 33 code shows immediately, then ultimately a 13 code. replaced the hot surface ignitor (previous one crumbled), blower motor is a little squeaky but was running successfully with squeaks for a long time.
#2
Welcome to the forums.
That would be rollout and are you quite sure of that ?
The service manual shows one or two based on the model.
If a rollout switch is open you'll get a code 13 after 3 minutes.
A 33 code is overheat. You need to check the high limit switches.
The igniter will not heat if any codes are present.
There are two limit switch loops.
Rollout loop on terminals 1 and 7.
High heat loop on terminals 2 and 3.
Carrier 58wav manual - pdf
there is no rolloff switch on these furnaces
The service manual shows one or two based on the model.
If a rollout switch is open you'll get a code 13 after 3 minutes.
A 33 code is overheat. You need to check the high limit switches.
The igniter will not heat if any codes are present.
There are two limit switch loops.
Rollout loop on terminals 1 and 7.
High heat loop on terminals 2 and 3.
Carrier 58wav manual - pdf
#4
Ok..... when looking closer it says "when used". They must be used on larger furnaces.
Yours uses the LS and FL. That's what is shown in the following picture. That's what you need to check. That device in the wire is a one-shot heat triggered safety device. It's called a pico fuse.
Yours uses the LS and FL. That's what is shown in the following picture. That's what you need to check. That device in the wire is a one-shot heat triggered safety device. It's called a pico fuse.
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Thanks @PJmax for the tips! It turns out that furnace #1 had a flipped rollout switch , which I figured out was located near the flue. Pushing the reset got that furnace working. Furnace #2 had a stuck limit switch, which as I needed a meter to confirm. Removed it, tapped it, and unstuck it, now the the furnace works! Moral to the story: I needed to change my filters sooner. Now I got those fancy Filtrete filters with the Bluetooth sensor, which tells me when to replace.
For limit switch troubleshooting, I found this video helpful..... limit switch video
For limit switch troubleshooting, I found this video helpful..... limit switch video
Last edited by PJmax; 12-05-21 at 08:46 PM. Reason: fixed link