Durham Region Air Conditioning Repair, Service and Installation
Standard and Remote Applications with LED M70 Control Board and R-410A.
Amana PTAC Air Conditioner Error Codes
CODE: FP.
RESULT: Freeze Protection Engaged. The room temperature measured by the wireless remote thermostat or indoor ambient thermistor active sensor falls below 40°F.
FIX: No Action required. This setting will disengage when the room temperature rises above 43°F.
RESULT: Freeze Protection Engaged. The room temperature measured by the wireless remote thermostat or indoor ambient thermistor active sensor falls below 40°F.
FIX: No Action required. This setting will disengage when the room temperature rises above 43°F.
CODE: Fd.
RESULT: Front Desk switch is closed. All outputs are switched off.
FIX: Open front desk switch to allow occupant unit operation.
RESULT: Front Desk switch is closed. All outputs are switched off.
FIX: Open front desk switch to allow occupant unit operation.
CODE: Eo.
RESULT: Un-Configured Service Board - All operation held awaiting configuration.
FIX: Enter Configuration Menu and set "C3" to "C" for coolers with electric heat or "H" for heat pumps.
RESULT: Un-Configured Service Board - All operation held awaiting configuration.
FIX: Enter Configuration Menu and set "C3" to "C" for coolers with electric heat or "H" for heat pumps.
CODE: EH.
RESULT: Emergency Hydronic Engaged. The EHH switch is closed. Compressor is switched off.
FIX: Open front emergency hydronic switch to allow occupant unit operation.
RESULT: Emergency Hydronic Engaged. The EHH switch is closed. Compressor is switched off.
FIX: Open front emergency hydronic switch to allow occupant unit operation.
CODE: LS.
RESULT: Load Shedding Engaged. The LS switch is closed. Compressor and Electric heat is switched off.
FIX: Open load shedding switch to allow occupant unit operation.
RESULT: Load Shedding Engaged. The LS switch is closed. Compressor and Electric heat is switched off.
FIX: Open load shedding switch to allow occupant unit operation.
CODE: On.
RESULT: Control is configured to respond to a wired thermostat.
FIX: No action if a wired thermostat is being used.Otherwise, see Configuration Settings.
RESULT: Control is configured to respond to a wired thermostat.
FIX: No action if a wired thermostat is being used.Otherwise, see Configuration Settings.
CODE: oP.
RESULT: Open Door Lockout (DS1 & DS2 open; wireless).
FIX: Close Room Door. Unit will not condition space with door open.
RESULT: Open Door Lockout (DS1 & DS2 open; wireless).
FIX: Close Room Door. Unit will not condition space with door open.
CODE: nP.
RESULT: Window Switch Lockout - (LS & INN open).
FIX: Close Room Door or Window. Unit will not condition space with door or window open.
RESULT: Window Switch Lockout - (LS & INN open).
FIX: Close Room Door or Window. Unit will not condition space with door or window open.
CODE: HP.
RESULT: Heat Sentinel - (WIAT > u3).
FIX: No action required. This setting will disengage when the room temperature falls.
RESULT: Heat Sentinel - (WIAT > u3).
FIX: No action required. This setting will disengage when the room temperature falls.
CODE: Ur.
RESULT: Un-Rented Status (EHH & INN or wireless).
FIX: Front Desk needs to set to Rented mode (if applicable).
RESULT: Un-Rented Status (EHH & INN or wireless).
FIX: Front Desk needs to set to Rented mode (if applicable).
CODE: F1.
RESULT: 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.
FIX: Replace black Indoor Ambient Thermistor or Wireless Remote Thermostat.
RESULT: 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.
FIX: Replace black Indoor Ambient Thermistor or Wireless Remote Thermostat.
CODE: F2.
RESULT: Wireless Remote Thermostat failure.
FIX: Replace Wireless Thermostat.
RESULT: Wireless Remote Thermostat failure.
FIX: Replace Wireless Thermostat.
CODE: F3.
RESULT: Indoor Ambient Thermistor reads outside the range -20°F to 200°F.
FIX: Replace black Indoor Ambient Thermistor.
RESULT: Indoor Ambient Thermistor reads outside the range -20°F to 200°F.
FIX: Replace black Indoor Ambient Thermistor.
CODE: F4.
RESULT: Indoor Coil Thermistor either above or below operating tolerances.
FIX: Replace Red Indoor Coil Thermistor.
RESULT: Indoor Coil Thermistor either above or below operating tolerances.
FIX: Replace Red Indoor Coil Thermistor.
CODE: F5.
RESULT: Wireless Thermostat failure.
FIX: Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat.
RESULT: Wireless Thermostat failure.
FIX: Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat.
CODE: F6.
RESULT: Indoor Discharge Thermistor either above or below operating tolerances.
FIX: Replace Yellow Indoor Discharge Thermistor.
RESULT: Indoor Discharge Thermistor either above or below operating tolerances.
FIX: Replace Yellow Indoor Discharge Thermistor.
CODE: Fb.
RESULT: Low Remote Battery Warning.
FIX: Replace Batteries in Wireless Devices.
RESULT: Low Remote Battery Warning.
FIX: Replace Batteries in Wireless Devices.
CODE: H1.
RESULT: High Voltage Protection engaged. Power supply voltage is to high.
FIX: Check for incoming power at correct voltage.
RESULT: High Voltage Protection engaged. Power supply voltage is to high.
FIX: Check for incoming power at correct voltage.
CODE: br.
RESULT: Brown Out Protection engaged. Power was lost or voltage is low.
FIX: Check for incoming power at correct voltage.
RESULT: Brown Out Protection engaged. Power was lost or voltage is low.
FIX: Check for incoming power at correct voltage.
CODE: L6.
RESULT: Discharge Air Too Hot.
FIX: Clean Filter or Remove Air Blockage.
RESULT: Discharge Air Too Hot.
FIX: Clean Filter or Remove Air Blockage.
CODE: LC.
RESULT: Outdoor Coil Thermistor temperature high.
FIX: Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning.
RESULT: Outdoor Coil Thermistor temperature high.
FIX: Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning.
CODE: C2.
RESULT: Indoor Air Recirculation. Large delta between thermostat and return.
FIX: Clean Filter or Remove Air Blockage or Close Vent Door or Improve indoor to outdoor seal.
RESULT: Indoor Air Recirculation. Large delta between thermostat and return.
FIX: Clean Filter or Remove Air Blockage or Close Vent Door or Improve indoor to outdoor seal.
CODE: C5.
RESULT: Outdoor Coil temperature too high for outdoor ambient temperature.
FIX: Check for Blocked Outdoor Air or Clean Coil.
RESULT: Outdoor Coil temperature too high for outdoor ambient temperature.
FIX: Check for Blocked Outdoor Air or Clean Coil.
CODE: C1.
RESULT: Indoor Coil is freezing up.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
RESULT: Indoor Coil is freezing up.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
CODE: C3.
RESULT: Indoor Coil is freezing up.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
RESULT: Indoor Coil is freezing up.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
CODE: C4.
RESULT: Indoor Coil froze up.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
RESULT: Indoor Coil froze up.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
CODE: C6.
RESULT: Poor Unit Performance.
FIX: Check for blower motor, compressor, or electric heat operation.
RESULT: Poor Unit Performance.
FIX: Check for blower motor, compressor, or electric heat operation.
CODE: C7.
RESULT: Indoor Freezing Lockout (ICT - IAT > 20) +10 Min.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
RESULT: Indoor Freezing Lockout (ICT - IAT > 20) +10 Min.
FIX: Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
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