Amana cool/heat unit PTH093B35AM gives error code F1, ( indoor ambient thermister reading out of range...... repalce thermister) I can't seem to locate a replacement part.

F1 - Control Board Failure - Replace control board (ERC). F2 - Oven Temperature Too Hot - Replace oven temperature sensor. F3 / F4 - Shorted or Open OvenTemperature Sensor - Replace oven temperature sensor. F5 / F6 / F8 - Control Board Failure - Replace control board.

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.

check indoor fan motor

you must read your instr. manual how to reset to default setting
go to www. fitness.manualsonline.com

God bless you

Replace black indoor ambient thermistor or wireless remote thermostat.

Replaceback Indoor Ambient Thermistor

I talked to LG customer support (800) 243-0000. The tech told me that this model had a problem with the indoor thermistor. It doesn't fail with an open-circuit condition, so you don't get an error code. The thermister just goes out of range and believes your indoor temp is much hotter than it is. That's why the heating never comes on. I'll bet that, even though it ran in COOLING mode, once your room reached setpoint, it just kept on cooling & cooling ... because the thermistor was still giving a false, high temp reading.

So, I bought a new thermistor, P/N 6323A20042A. My unit worked fine. Until the next week when I turned heating back on and now I have the same problem ... gives cooling but no heat. Something is failing the indoor thermistor OR the distributor sent me an old-style thermistor, I haven't gotten determination on that yet.

Regardless, call LG and see if they can't direct you to a distributor for an indoor sensor. LG's warranty coverage for parts is a royal pain, unless you can show a receipt by a certified installer, you're not going to have much luck getting payment for the part. However, the thermistor is only $10. Just hope you get one that doesn't fail on you!

see if you can find a new board the power failure fried it

the unit needs to be programed to operate in heat and cool mode

Indoor ambient thernistor (black) may need replaced.