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Carrier rooftop unit mod #48hjd015..... (6) six flashes ..

Customer Question
carrier rooftop unit mod...

carrier rooftop unit mod #48hjd015..... (6) six flashes .. draft inducer... replaced with part # hc30gb230 factory part.. still (6) flashes... replaced igniter module part #lh33wp002... still (6) flashes.. proved good ground.. still (6) flashes

Contractor's Assistant: Did you double-check the thermostat? And what about the unit's filters?

Thermostat is calling .. jumped R+ to W1 24vac present.. filters have been changed...

Contractor's Assistant: Do you plan on doing the work yourself?

Yes... 06A and CFC lic.

Contractor's Assistant: Anything else we should know to help you best?

Tested all my safety and roll-out switches but all these things must be in place before inducer will go ..no other codes... unit next to it (same mod) also gives (6) flashes when I pull inducer sensor.. thought bad board. it happens out of the box so installed new and new sensor on motor.. still (6)

Submitted: 7 months ago.Category: HVAC
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Answered in 4 minutes by:
12/15/2017
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,121
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

Hello,

My name is Billy. Does the draft fan run when started?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

and when you say you replaced sensor...is it the Hall Effect Sensor?

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Customer reply replied 7 months ago
replaced with new out of box motor and control board have them both on shelf...(x2)
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

Thank you,

And the board you replaced...is the board the hall effect sensor plugs on to?...3 prong molex?

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Customer reply replied 7 months ago
oem part # Lh33wp002
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

Thank you. And you checked the vent assembly to make sure no blockage?...did you check the heat exchanger at the back turns where these are notorious for holes?

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Customer reply replied 7 months ago
no blockage... no pressure switch.. did not check heat exchanger..
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

Ok ,

Is this series rtu one that has a limit switch in the blower section? A reset limit?

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Customer reply replied 7 months ago
tested ok but jumped for piece of mind cause im losing mine
Customer reply replied 7 months ago
two limits and one role out
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

Wow...there is not much more.....I assume you already confirmed a proper ground?

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Customer reply replied 7 months ago
added an extra from service ground lug..
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

single or 3 ph?

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Customer reply replied 7 months ago
3 phase unit .. 208 inducer
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

The strange thing is the hall effect is just magnetic response...as long as the idm shaft spins it creates the pulse....you can actually do this by spinning the unit by hand.

It must be in the ground, supply, phase etc....the effect sensor itself is just a dc reaction....

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Customer reply replied 7 months ago
changed magnet even added an extra still (6) flashes
Customer reply replied 7 months ago
she is running at full speed motor is 3400 rpm but I have used two new motors and two new control boards
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

Well you won the award today for the stump the panel....

I am going to open this up to the others to have a look and see if we can come up with something.

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Customer reply replied 7 months ago
even ruffed up inside of last sensor body
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