Toptech Thermostat Troubleshooting

How to eliminate problems with a Toptech thermostat? On this page, you can find a manual for repairing your model. Every Toptech thermostat troubleshooting guide is made in the form of a table that enlists the most common technical issues and the detailed guidelines on how to solve problems efficiently.

Toptech TP-N-605 Thermostat Troubleshooting

Problem Solution
The word HEAT or COOL is flashing in the thermostat displayThis indicates that the heating or cooling system is currently running. When these systems are not running, HEAT or COOL will not flash
HEAT or COOL is flashing but the system is not runningThe thermostat is telling the heating or cooling system to run, but the system is not responding.
You may need to call your local heating and air conditioning contractor
Thermostat does not turn on heating or cooling systemCheck to see if OFF is shown in display. This indicates that the system is turned off at the thermostat.
Move the system selector switch to the HEAT or COOL position. After the compressor short cycle protection 5-minute period expires the system should start.
Compressor protection feature may be in effect due to compressor short cycle conditions. Heating or cooling system may be malfunctioning.
Call a professional service technician immediately to verify system operation
Thermostat turns on heating instead of cooling or cooling instead of heatingCheck thermostat wiring to make sure that the heating and cooling stages are connected to the correct terminals on the wiring terminal block
Thermostat turns heating or cooling system on too often or not often enoughIncrease or decrease first stage temperature differential setting as appropriate to provide the desired performance level
Low battery indicator is shown in thermostat displayReplace batteries immediately to maintain proper system operation
OFF is shown in thermostat display and heating or cooling system will not startThis indicates that the system is turned off at the thermostat.
The thermostat must be in HEAT or COOL modes of operation to control the heating or cooling system.
Move the system selector switch to the HEAT or COOL position
Thermostat display is blankIt is possible that AC power is not present at the thermostat or the batteries are drained.
Check fuse, circuit breaker and thermostat wiring as appropriate to verify AC power is available.
Replace batteries before reprogramming thermostat.
If AC power is present, call a professional service technician to verify thermostat and system performance

Toptech TP-S-955WH Thermostat Troubleshooting

Problem Solution
Clock losing timeWhen the temperature limit is exceeded, the furnace shuts off the burners and the 24VAC to the thermostat. When the stat loses power, the clock stops. The furnace blower remains on, so the homeowner may never notice a problem, and when the temperature is back within limits, the burners come back on, and the power to the stat is restored. The clock will be slow by however many minutes the power was off to the thermostat. Correction: Find the cause of the high temperatures – dirty filter, etc
Display goes blank or shows “PF” when starting cooling or heatingThe thermostat only does this when there is no common wire. If the common wire is present, check it for continuity, look for a short, a broken wire, or a bad connection. If the equipment is a heat pump, or heat only or cool only, you MUST have a common wire. If the equipment is gas/electric, the stat will work without a common, but if it goes blank when starting the heat or cool, add the resistor (included with the thermostat) at the equipment side (not at the thermostat!) between W and C
Unit running backwardschange the heat pump setting. If the unit is a commercial heat pump, it may not require a heat pump thermostat, so step 3 should be turned OFF. In this case, electric heat may have to be turned ON
Display goes blank during heatingmost likely the furnace is tripping on high limit or some other safety limit. The furnace will shut off the burners AND break the R leg to the thermostat, so the thermostat has no power and will go blank. Solution – identify the cause of the limit trips
Wireless thermostat won’t turn on heat or coolcheck the house code on the thermostat and on the receiver. They must match. The house code on the receiver is set using dip switches, the house code on the thermostat is set in the thermostat setup
Also, check batteries – these thermostats require AA Lithium batteries, alkalines will not work correctly
Batteries die rapidly in wireless statmake sure the batteries are AA Lithium batteries. Regular alkaline batteries will die rapidly and cause erratic thermostat operation. If the backlight is ON, the batteries will run down very rapidly.
If the customer really wants the backlight on all the time, use the optional transformer part # P474-0800 to plug the thermostat into a wall outlet
Buttons don’t workmost likely the keypad is locked. Press Mode, Up and Down simultaneously to unlock the buttons
Temperature inaccurateCalibrate the thermostat. On 4 button models, press Mode and Down for two seconds, the whole display will light up. Press Mode, and the room temperature will appear.
Use the Up or Down buttons to adjust the temperature. Press Mode to exit.
On 8 button models (with a door), hold Mode and Fan for 5 seconds, the whole display will light up. Press Up and Down simultaneously once, then again. Room temperature will appear.
Use Up or Down to adjust temperature, press Mode to exit
Fan doesn’t come on with the heatTurn electric heat on
Thermostat settings change or scramble when supplemental heat comes onSome heat pumps create a large voltage spike when the unit goes in to defrost and/or when the supplemental heat comes on. This large voltage spike can cause the microchip in the thermostat to reset, changing settings
Settings can be restored with a factory reset, but if the problem is re-occurring, replace the thermostat with a flush-mount model, a P474-1050, -2050, or -2150, a 33CSSP2-WC, or with a newer Signature or Debonair with a date code later than 1499, all of which have additional high voltage protection
Remote sensors don’t show correct temperatureCheck that the degree symbol on the thermostat is flashing – if it is not flashing, the remote sensor is not connected correctly.
Check wiring and make sure that you are not using shielded wire, as this will throw temperature off.
Do not reverse RS+5 and RS GND as this may damage the sensor!
Do not use an ohmmeter to test the sensor – these are digital sensors, not thermistors, and they can be damaged by an ohmmeter
Thermostat doesn’t respond to changes in room temperaturethis happens when there is air blowing through the thermostat from the wall behind it. Insulate the hole behind the thermostat with insulation, spray foam, or even duct tape – whatever will stop the airflow from behind the wall
Erratic operation, partial display, or fluctuating temperatureThis can be caused by poor pin connections between the backplate and the thermostat, almost always because the backplate is flexed against an uneven wall. Loosen the screws that attach the backplate to the wall, allowing the backplate to flatten out, then snap thermostat back onto the backplate