PDA

View Full Version : Blower working,hot surface ignitor not lighting up


carpetman
Mar 11, 2008, 11:35 AM
My furnace is a Carrier,about 9 years old. My blower runs but there is no heat. Have done some research so I replaced the HSI because there was a white spot on it and it was not lighting up. It still is not lighting up. Could someone tell me what I should do next. Thanks.

hvac1000
Mar 11, 2008, 01:58 PM
Check for voltafge at the HSI. Then check for voltage at the board plug in.

If the board has a fuse check it also.
Have you replaced the thermostat lately?

carpetman
Mar 11, 2008, 03:18 PM
Have not checked voltage. Is it supposed to be at 120v? Have not replaced thermostat but recently changed batteries. Checked fuse it was a 3 fuse OK. Where do I check the voltage on the board?

hvac1000
Mar 11, 2008, 03:23 PM
Follow the leeds bach to the board or unplug the HSI and test there. Set volt meter at 120.

How many blinks does your circuit board show for a fault code. Fault codes will be listed on the inside of the blower compartment door.

carpetman
Mar 11, 2008, 04:06 PM
The led light is blinking a 3-3. Went and purchased a digital voltage meter. You can set it for AC at 200 or 500. I set it at 200, put the two probes where the HSI connects and it read a 0. Not sure if Im doing it right, sorry first home trying to teach myself.

hvac1000
Mar 11, 2008, 05:26 PM
HSI is 115 volt amp draw 1.0

33 LIMIT CIRCUIT FAULT - Indicates a limit, or flame rollout is open.

There is a wiring diagram inside the blower. It should also contain a blink code number list and fault.

hvac1000
Mar 11, 2008, 05:31 PM
? Is the blower motor you are talking about the main house blower or the draft inducer motor on the front of the unit?

carpetman
Mar 11, 2008, 06:31 PM
It's the main blower at the bottom of the unit. Its big. It is a #33 , flame rollout is open, but it also states if open for more than 3 minutes it's a #13 lockout.? What does this mean, next step? Thanks.

hvac1000
Mar 11, 2008, 06:45 PM
13 LIMIT CIRCUIT LOCKOUT - Lockout occurs if the limit or flame rollout switch is
Open longer than 3 minutes.
- Control will auto reset after three hours. - Refer to #33.


33 LIMIT CIRCUIT FAULT - Indicates a limit, or flame rollout is open. Blower will
Run for 4 minutes or until open switch remakes whichever is longer. If open
Longer than 3 minutes, code changes to lockout #13. If open less than 3 minutes
Status code #33 continues to flash until blower shuts off. Flame rollout switch
Requires manual reset. Check for: - Restricted vent
- Proper vent sizing - Loose blower wheel - Excessive wind
- Dirty filter or restricted duct system.
- Defective blower motor or capacitor. - Defective switch or connections.
- Inadequate combustion air supply (Flame Roll-out Switch open)

carpetman
Mar 11, 2008, 08:14 PM
How do I know if I have any defective switches or connections? Vent sizing OK, blower wheel OK, filter OK. Do I need to manually reset flame rollout switch, if so where is it and how? Also why is there no voltage when I test the plug that connects to th HSI?

hvac1000
Mar 11, 2008, 10:02 PM
Flame roll out switch located near front of furnace right above burner area.

carpetman
Mar 12, 2008, 01:28 PM
What is the little black wheel in front that says rotation on it?

hvac1000
Mar 12, 2008, 01:33 PM
That is the combustion/vent fan. It needs to be running for the unit to fire up.

carpetman
Mar 12, 2008, 01:41 PM
So do you think I should replace it? Does that explain having no voltage on the HSI as well?

hvac1000
Mar 12, 2008, 03:22 PM
What is the little black wheel doing? Does it run/spin?

You need to test the motor on the fan for the little blower wheel before you replace it.

carpetman
Mar 12, 2008, 03:40 PM
Its not spinning at all. And how do I test the motor on the fan.

hvac1000
Mar 12, 2008, 04:48 PM
Remove connector. Apply rated voltage to wires. Motor should be 120 bolts.

carpetman
Mar 12, 2008, 05:09 PM
I applied my meter to the wires that plugged into the fan and it read 0.

hvac1000
Mar 12, 2008, 05:16 PM
Yiu are not getting voltage at the board. If you want to test the fan you need to apply 120 volts to the fan motor from another source.

hvac1000
Mar 12, 2008, 05:18 PM
Post the exact model number of your unit.

carpetman
Mar 12, 2008, 05:25 PM
Model # is 58PAV090-14 Carrier Furnace 1999, by the way thanks for all your help.

hvac1000
Mar 12, 2008, 06:08 PM
Model # is 58PAV090-14 Carrier Furnace 1999, by the way thanks for all your help.

Here is a complete install manual with wiring diagrams and trouble shooting.
This is all I have to offer as anything I know about your furnace is contained in the file below.

It might take you sometime to figure it out but if you have the time it can be a learning experience for you.

All answers for your questions are contained below.


http://www.alltemp-hvac.com/58pa-15si.pdf



And here is a check list for you to work with. Good luck.



11 NO PREVIOUS CODE - Stored status codes are erased when power (115V or 24V) to control is
Interrupted or 48 hours after each fault is cleared.
12 BLOWER ON AFTER POWER UP (115V or 24V) - Blower runs for 90 seconds, if unit
Is powered up during a call for heat (R-W closed).
13 LIMIT OR FLAME ROLL-OUT SWITCH LOCKOUT - Auto reset after three hours. For flame
Roll-out switch or fuse link, refer to #33.
14 IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to #34.
21 GAS HEATING LOCKOUT - Control will NOT auto reset.
Check for: - Stuck gas valve relay on control or miswire to gas valve circuit.
22 ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is
De-energized. Inducer will run until fault is cleared. Check for:
- Stuck-open gas valve or leaky gas valve.
23 PRESSURE SWITCH DID NOT OPEN Check for:
- Obstructed pressure tubing. - Defective pressure switch (stuck closed).
24 SECONDARY VOLTAGE FUSE IS OPEN
Check for: - Short circuit in secondary voltage (24V) wiring.
31 PRESSURE, DRAFT SAFEGUARD, OR AUXILIARY-LIMIT (when used) SWITCH DID
NOT CLOSE OR REOPENED - If open longer than five minutes, inducer shuts off for
15 minutes before retry. Check for:
- Proper vent sizing and condensate pitch. - Inadequate Combustion air supply.
- Vent restriction or high winds. - Low inducer voltage.
- Defective inducer motor or start capacitor. - Disconnected or obstructed pressure tubing.
- Defective pressure switch or connections. If it opens after trial for ignition period, blower will
Come on for 90 second recycle delay.
33 LIMIT OR FLAME ROLL-OUT SWITCH IS OPEN - If open longer than three minutes, code
Changes to #13. Check for:
- Defective blower motor or start capacitor. - Dirty filter or restricted duct system.
- Loose blower wheel. - Defective switch or connections.
- Inadequate Combustion air supply Flame Roll-out Switch or fuse link.
- Open Flame Roll-out switch,or fuse link. Manual reset or replace.
34 IGNITION PROVING FAILURE - Control will try three more times before a lockout #14
Occurs. If flame signal lost after trial for ignition period, blower will come on for
90 second recycle delay. Check for:
- Oxide buildup on flame sensor (clean with fine sandpaper).
- Proper flame sense microamps (.5 microamps D.C. minimum).
- Gas valve turned off. - Manual shut-off valve. - Low inlet gas pressure.
- Green wire MUST be connected to furnace sheet metal.
- Inadequate flame carryover or rough ignition.
COMPONENT TEST
To initiate the component test sequence,shut OFF the room thermostat or disconnect the "R"
Thermostat lead. Briefly short the TEST terminal to the ’C’ terminal. Status LED will flash code and
Then turn on the inducer motor, hot surface igniter, blower motor-heat speed, and blower motor-cool

carpetman
Mar 12, 2008, 06:24 PM
Thanks.

hvac1000
Mar 12, 2008, 06:49 PM
How do I test to see if a pressure switch is operating properly.


Set your meter to volts AC, turn your furnace on so it is calling for heat. The draft inducer should start. There should be either two or three wires going into your pressure switch. Probe one lead of the pressure with one lead of your meter while touching the other lead of your meter to ground. Ground would be any bare metal part of your furnace. This must be bare metal. I always try to touch the other lead of my meter to the furnace's switch box. If you have a two wire pressure switch you should be getting 24 or more volts between both leads to ground. By this I mean if you touch one terminal of the pressure switch with one lead of your meter, and touch the other lead of your meter to a ground, bare metal part of your furnace, you should get 24 or more volts (24 to 28 volts). If you do not get 24 or more volts with the furnace running then you have a pressure switch problem. Your vent could be stopped up, The tube that runs from your pressure switch to the draft inducer could be plugged up or the draft inducer hole could be plugged up. On high efficiency condensing furnaces the water drain line could be stopped up, causing a water back up and blockage in the pressure switch tube. I usually take the drain hose loose from the condensing furnace and use a wet vacuum to open the drain back up. I hope this will help you in troubleshooting your gas furnace pressure switch.

paolo7
Apr 22, 2010, 10:21 AM
I got HVAC Honeywell Smart Valve and hot surface igniter and similar problem with furnace. Measured voltage coming to the igniter and it's 10V. Also measured the resistance of HSI which showed ~3 ohms. Any advises? Thanks