Saunier Duval THEMA F 23 E Installation Instruction

Replace main pcb

Refer to chart n

°

2

Check mains water

supply, water filter

Is there at least 3 litres/min

water flow at tap ?

Remove leads from boiler

thermistor. Check its resistance

in accordance with thermistor

value table. Is thermistor ok ?

Check operation of water valve

diaphragm. Does reversing

valve mechanism move when

hot tap is opened ?

Replace

diaphragm

Replace thermistor

Open hot tap fully.

Does burner fire ?

YES

NO

NO

YES

YES

NO

With selector switch/thermostat

in

position and turner to maxi-

mum. Does burner fire for CH ?

Is there continuity across DHW

microswitch and PCB

 connections cn 6.4 and cn 6.9 ?

YES

Replace dhw

microswitch

Is there 240 v at pump ?

YES

Is there 240 v at

terminal cn2 of PCB ?

Is there 240 v at fan ?

NO

YES

NO

NO

NO

Replace main PCB

YES

NO

NO

Is pump jammed ?

Replace

pump motor

NO

Free pump

Replace main PCB

Is fan jammed ?

Replace fan

NO

When ordering spare parts, quote the part number and description, stating the appliance model number
and serial number from the data badge.

1

Fan

57059

2

Pump

51236

3

Spark generator

51110

4

Air pressure switch

51692

5

Main PCB (SB models)

57267

6

Main PCB (THEMA F 23 E)

57265

7

Control PCB (all models)

57277

8

Water valve diaphragm kit

52519

9

Microswitch assembly (THEMA F 23 E)51590

10

Temperature/pressure gauge

57278

11

Boiler Thermistor

57060

12

Overheat thermostat

51199

°

Ω

°

Ω