Danfoss TP5001 programmable room thermostat: what its codes, symbols and messages mean

The heating is active. Danfoss’s LCD overview lists the three wavy lines as “Heating active”; its symbol list has no flame.

Applies to: TP5001, TP5001B and TP5001RF. What you see: a symbol.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.

Frost protection is active, which on the TP5001 means the thermostat is switched OFF (standby). Danfoss says that in standby it is set to the frost protection temperature and switches on only if the measured temperature falls below it, 5 °C by default; the frost protect icon and the current temperature are shown.

Applies to: TP5001, TP5001B and TP5001RF. What you see: a symbol.

What Danfoss says to do

1. Press the power button to switch the thermostat back on from OFF (standby); Danfoss says the same button switches it between on and standby.
2. The frost temperature itself is parameter P06 (5 to 15 °C, 5 °C by default): hold M for 6 seconds to enter the parameter settings, press M to move to P06 and set it with < or >. The guide exits by itself after 20 seconds with no button pressed.

The thermostat is following its timer program. Danfoss lists the clock as “Schedule mode”. With no program of your own it runs Danfoss’s default: Monday to Friday 20 °C from 6:30, 15 °C from 8:30, 20 °C from 16:30 and 15 °C from 22:30; Saturday and Sunday the same temperatures from 7:30, 9:30, 16:30 and 22:30.

Applies to: TP5001, TP5001B and TP5001RF. What you see: a symbol.

What Danfoss says to do

1. To change the temperature until the next programmed setting, press < or >: Danfoss says SET is shown and the change is only temporary.
2. To change the schedule itself, hold the clock button for 3 seconds and set the start hour, minute and temperature of each of the four events with < or >, accepting each with the clock button.
3. If you want no schedule, the installer parameter P01 switches the working mode between 01 Manual, 02 5/2-day timer (the default) and 03 24-hour timer.

Away mode is on: the thermostat holds the Away temperature instead of following the schedule. Danfoss says pressing M enters Away mode and shows the suitcase.

Applies to: TP5001, TP5001B and TP5001RF. What you see: a symbol.

What Danfoss says to do

1. Press M again to leave Away mode; Danfoss says M both enters and exits it.
2. The Away temperature is parameter P07, 18 °C by default, set within the low and high limits P05 and P04.

This is the wireless (RF) link to the receiver. Danfoss lists it as “RF Status” and says it appears on the TP5001RF only; when that link fails the screen shows E3 or E4 (below) instead.

Applies to: TP5001RF only. What you see: a symbol.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.

The batteries are low. Danfoss lists it as “Battery low indicator” and says only the battery TP5001B and the wireless TP5001RF show it.

Applies to: TP5001B and TP5001RF only. What you see: a symbol.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.

You are changing the set temperature, the temperature the thermostat aims for. Danfoss says SET is shown while you press < or >, and the temperature moves in 0.5 °C steps.

Applies to: TP5001, TP5001B and TP5001RF. What you see: words.

What Danfoss says to do

1. Let go of < or > and Danfoss says the screen goes back to the actual temperature.
2. In schedule mode the new temperature lasts only until the next programmed setting.

The thermostat’s temperature sensor has failed. Danfoss’s error list gives E1 as “Sensor failure”.

Applies to: TP5001, TP5001B and TP5001RF. What you see: a code.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.

Two different wireless faults. E3 means RF pairing failed: the thermostat could not pair with its receiver. E4 means the RF signal is lost. The guide gives no step for either; the only RF setting in its parameter list is RF pairing, installer parameter P10 (00 off, 01 on).

Applies to: TP5001RF only. What you see: a code.

Codes this covers: E3 E4.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.

An internal part has failed. Danfoss gives E6 as a “Real Time Clock (RTC)” failure and EE as an “EEPROM failure” (a memory chip). The guide gives no step for either.

Applies to: TP5001, TP5001B and TP5001RF. What you see: a code.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.

The room is outside what the thermostat measures. Danfoss lists Lo as a measured temperature below 0 °C and Hi as one above 50 °C.

Applies to: TP5001, TP5001B and TP5001RF. What you see: words.

What to do

Danfoss gives no step for this on the page cited; the meaning above is all it says.