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8 flashes, bad IAT

How do I fix my PTAC, I have 8 flashes, "replace room thermistor (IAT)"

Posted by Roger Patel on

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Anonymous

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Take the buttons off of your unit and remove the board cover by taking out the 2 screws on each side holding it in.  You will See on the right hand side of the board 4 post specifically , 2 for your indoor thermistor and 2 for your outdoor.  unplug your inddor  from the board ( make sure power is off)   and there should be a plate you can remove on the front of the unit on the right hand side of your evaporator coil , remove this and disconnect your thermistor from the coil (should snap right off )   pick up a new thermistor and just slide it right back in.

Posted on Oct 13, 2007

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I have PTAC PTH123A50AB that has red LED that flashes, and the air is warm. No cold air at all.

Posted on Aug 02, 2008

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Scotsman c0330 is not making ice and display code flashing 8

Low room temperature - Most Scotsman ice makers won't produce ice when the temperature is below 55 degrees Fahrenheit. Make sure the machine is in a room or setting that is warmer. ... Faulty thermistor - A bad thermistor usually causes the bin to fill with too much ice.


Diagnostic Codes


  • 1 - Long freeze time. Shutting down.
  • 1 (flashing) - Retrying long freeze cycle.
  • 2 - Long harvest time. Shutting down.
  • 2 (flashing) - Retrying long harvest cycle.
  • 3 - Water filling slowly.
  • 4 - High discharging temperature.
  • 5 - Failed sump temp sensor.
  • 7 - Failed discharge temp sensor.
  • 8 - Thin ice from short freeze cycle.
  • 8 (flashing) - Retrying short freeze cycle.
tip

Intake air temperature sensor on engines

1.2) IAT - Intake Air Temperature sensor

What is it? The intake air temperature sensor is a small electrical device (Thermistor - temperature dependent resistor) that consists of a small bead on a loop of wire held within a plastic safety frame.

Where is it located? Is most often found associated with the MAF (AMM) in the air ducting immediately after the air filter/cleaner box. On cars without a MAF (a manifold pressure sensor - MAP usually takes on the role) the IAT may be sited nearer the throttle opening in the air ducting. It has only two wires that make connection with it. However, when located with the MAF, a combined multi-pin plug will serve both devices.

How does it work? It measures the intake air temperature by simply measuring the resistance in the thermistor bead on the wire. The IAT is most commonly located alongside the MAF. The IAT thermistor sends a signal proportionate to the air temperature (if the usual NTC thermistor the resistance drops with increasing temperature; if PTC type them resistance increases with increasing temperature). With the engine running, fresh air is drawn through the ducting and cools the heated MAF. The temperature of the air, in conjunction with its ability to cool the MAF allows the ECU to determine the mass of air entering the engine and thereby to select the appropriate amount of fuel by adjusting the injection times.

Symptoms of a faulty IAT
Associated OBD2 error codesDTCs: P0110 - P0114; P0127

  • Higher erratic idle speed - If the IAT is at fault the ECU cannot accurately work out the mass of air entering the engine and may use a default value that is inappropriate.
  • Erratic engine - In the absence of signals from the IAT and MAF the ECU takes readings from the TPS and other sensors and this causes a rough running engine.

How to Check? Unplug the device from the duct and check that it is clean. Put a voltmeter across the contacts and measure the resistance due to the ambient air temperature. If you then breathe on it, raising the local air temperature around the probe, you will see the resistance change as a consequence. You are looking for a change in resistance in line with a change of air temperature. If there is infinite resistance, consistent with a broken circuit, or there is no measurable response to change in air temperature then the IAT is faulty.

How to Fix? Replace it


NEXT 1.3 TPS Throttle Position Sensors
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What does error code LF mean in a PTAC unit model #PTH093B35AM?? Several of our units are doing this, they run but won't put out any heat? Please help!!

If there are no active failures or lockouts, the display will show a double dash, "- -". If there is a code listed, see the unit "Diagnostic Codes" chart for a list of definitions. Error Codes Problem FP Freeze Protection Engaged. The room temperature measured by the wireless remote thermostat or indoor ambient thermistor active sensor falls below 40°F. No Action required. This setting will disengage when the room temperature rises above 43°F. Fd Front Desk switch is closed. All outputs are switched off. Open front desk switch to allow occupant unit operation. Eo Un-Configured Service Board - All operation held awaiting configuration. Enter Configuration Menu and set "C3" to "C" for coolers with electric heat or "H" for heat pumps. EH Emergency Hydronic Engaged. The EHH switch is closed. Compressor is switched off. Open front emergency hydronic switch to allow occupant unit operation. LS Load Shedding Engaged. The LS switch is closed. Compressor and Electric heat is switched off. Open load shedding switch to allow occupant unit operation. On Control is configured to respond to a wired thermostat. No action if a wired thermostat is being used. Otherwise, see Configuration Settings. oP Open Door Lockout (DS1 & DS2 open; wireless). Close Room Door. Unit will not condition space with door open. nP Window Switch Lockout - (LS & INN open). Close Room Door or Window. Unit will not condition space with door or window open. HP Heat Sentinel - (WIAT > u3). No action required. This setting will disengage when the room temperature falls. Ur Un-Rented Status (EHH & INN or wireless). Front Desk needs to set to Rented mode (if applicable). F1 Indoor Ambient Thermistor reads outside the range -20°F to 200°F & the wireless thermostat is not communicating to the unit control or Indoor Ambient Thermistor (IAT) without a wireless remote thermostat reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor or Wireless Remote Thermostat. F2 Wireless Remote Thermostat failure. Replace Wireless Thermostat. F3 Indoor Ambient Thermistor reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor. F4 Indoor Coil Thermistor either above or below operating tolerances. Replace Red Indoor Coil Thermistor. F5 Wireless Thermostat failure. Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat. F6 Indoor Discharge Thermistor either above or below operating tolerances. Replace Yellow Indoor Discharge Thermistor. Fb Low Remote Battery Warning. Replace Batteries in Wireless Devices. H1 High Voltage Protection engaged. Power supply voltage is to high. Check for incoming power at correct voltage. br Brown Out Protection engaged. Power was lost or voltage is low. Check for incoming power at correct voltage. L6 Discharge Air Too Hot. Clean Filter or Remove Air Blockage. LC Outdoor Coil Thermistor temperature high. Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning. C2 Indoor Air Recirculation. Large delta between thermostat and return. Clean Filter or Remove Air Blockage or Close Vent Door or Improve indoor to outdoor seal. C5 Outdoor Coil temperature too high for outdoor ambient temperature. Check for Blocked Outdoor Air or Clean Coil. C1 Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube. C3 Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube. C4 Indoor Coil froze up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube. C6 Poor Unit Performance. Check for blower motor, compressor, or electric heat operation. C7 Indoor Freezing Lockout (ICT - IAT > 20) +10 Min. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
0helpful
2answers

GE PTAC 5500 series cooling and then blowing hot

Cooling gas is missing. Call some AC service in near to fill it, ask more of them for price. Do not switch it on until you solve this to prevent higher damage.
0helpful
2answers

I have a Amana unit Model# PGA60C1152F that has a blinking light on the control board it blinks 4 times. That heat will come on then go off but the blower nevers comes on.

look on the inside of the door that you took off and there should be a diagram and on that there will flash code that will tell you what 4 flashes means.i think it is a flame rollout or high limit.
2helpful
1answer

Where is the IAT sensor on the 1993 corvette

Hi Terry:
The IAT sensor is a thermistor which supplies intake air temperature information to the PCM. The IAT is located in or near the air intake duct.

3_1_2012_3_27_41_pm.jpg

Fig. 1: On VIN 8 engines, the MAT (or IAT) is mounted in the intake plenum


3_1_2012_3_28_07_pm.jpg

Fig. 2: On most vehicles, the IAT sensor is threaded into the throttle body extension

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.
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Model 110 73932101 kenmore elite. Blew the circuit board replaced it and checked the relays. Wont heat, found the thermal fuse is blown. Checked the high limit thermostat and the thermistor. Thermistor...

there is thermal fuse, Hi limit, and thermistor. the thermistor should have continuity at room temp I don't know what resistence(ohms) it should have. Most units I have seen provide a schematic and trouble shooting guide taped under the control panel for service personal.
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Hello my check engine light is on i went to local parts house had them read the code low input voltage in the iat sensor so i bought a new one had the code cleared and before i left parking lot light was...

Keep in mind that the IAT (intake air temperature) sensor simply measures the temperature of air that is entering the engine. Intake air temperature is important because the higher the intake air, the higher the combustion temperatures. High combustion temperatures result in increased Nox (Nitrogen oxides) emissions. To keep these higher temps from causing increased combustion temps, the intake air tubing should be intact, allowing the engine to "breathe" air that isn't sampled from the engine compartment. The IAT measures air temp by using a thermistor, or a thermometer of sorts. The thermistor is supplied 5 volts reference voltage from the PCM (powertrain control module) and a ground. Usually, when the air temperature is cold the resistance in the thermistor is high and when the air temperature is warmer, the resistance decreases. This change in resistance changes the 5 V reference from the PCM, thereby informing the PCM of the temperature of incoming air. If the PCM notices that the incoming air temp is unusually high, say, 300 degrees, when the engine temp is still relatively low, it will set a P0112.

Symptoms: There may be no noticeable symptoms of a P0112 code other than an MIL (Malfunction Indicator Lamp). However, a emissions test may reveal higher Nox readings depending on the type of IAT failure. Or the engine may ping under load, depending on the type of IAT failure.

Causes: Usually the P0112 is caused by a bad IAT (internally shorted or open or otherwise damaged), but it could also be:
* No reference voltage to the IAT sensor due to an open wire
* Excessively high intake air temperatures
* Short to ground on signal circuit
* Damaged IAT connector
* Bad PCM

Possible Solutions:
Hook up your scan tool or code reader and read the IAT reading. With a cold engine, the IAT should roughly match the coolant reading, since both will read ambient temperature. If the IAT is reading excessively high, check the IAT connector for damage. If you find none, unplug the IAT sensor and recheck the reading. It should now read the minimum, around -20 deg. If it does, then replace the IAT sensor. But, if the reading is still high, unplug the sensor and check for resistance across the two wiring harness terminals. If there is infinite resistance, then the PCM itself is bad. If the resistance isn't infinite, then check and repair the short to ground on the signal circuit.

Keep us updated.
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Iat sensor high input

What is it? The intake air temperature sensor is small electrical device (Thermistor - temperature dependent resistor) that consists of a small bead on a loop of wire held within a plastic safety frame.


Where is it located? Is most often found associated with the MAF (AMM) in the air ducting immediately after the air filter/cleaner box. On cars without a MAF (a manifold pressure sensor usually takes on the role) the IAT may be sited nearer the throttle opening in the air ducting. It has only two wires that make connection with it. However, when located with the MAF, a combined multi-pin plug will serve both devices.


How does it work? It measures the intake air temperature by simply measuring the resistance in the thermistor bead on the wire. The IAT is most commonly located alongside the MAF. The IAT thermistor sends a signal proportionate to the air temperature (if the usual NTC thermistor the resistance drops with increasing temperature; if PTC type them resistance increases with increasing temperature). With the engine running, fresh air is drawn through the ducting and cools the heated MAF. The temperature of the air, in conjunction with its ability to cool the MAF allows the ECU to determine the mass of air entering the engine and thereby to select the appropriate amount of fuel to use by altering the injection times.


Symptoms of a faulty IAT


  • Higher erratic idle speed - If the IAT is at fault the ECU cannot accurately work out the mass of air entering the engine and may use a default value that is inappropriate.
  • Erratic engine - In the absence of signals from the IAT and MAF the ECU takes readings from the TPS and other sensors and this causes a rough running engine.


How to Check? Unplug the device from the duct and check that it is clean. Put a voltmeter across the contacts and measure the resistance due to the ambient air temperature. If you then breathe on it, raising the local air temperature around the probe, you will see the resistance change as a consequence. You are looking for a change in resistance in line with a change of air temperature. If there is infinite resistance, consistent with a broken circuit, or there is no measurable response to change in air temperature then the IAT is faulty.


How to Fix? Replace it

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1answer

Ptac heating problem

This is the service manual for this system. It might give you an idea on what the problem could be. Page 27 should be your area to start. There are two for the PTAC series. I'm not sure which one will pertain to you.
http://www.friedrich.com/downloads/PTAC_Service_P-Series.pdf
http://www.friedrich.com/downloads/PTAC_Service_PD-Series.pdf
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