74 PB
TROUBLESHOOTING
Electric Heater Not Running
The normal resistance of the heater can be calculated as R=U*U/P, U is rated voltage, P is rated power.
For 3.6 kW @230V, the R is 14.69 Ω ±15%.
For 5 kW @230V, the R is 10.58Ω ±15%.
For 3.6 k W@265V, the R is 19.5Ω ±15%.
For 5 kW @265V, the R is 14Ω ±15%.
Check the red and blue wires connected to the relays,
See where the ngers point to. 3.6kW@230V is measured as 13.2Ω. The thermostat and thermal fuse are almost 0Ω,
if measured over 5 Ω that is broken.
DIP switch of NO.3 is in OFF position. Set it to ON position.
Figure 726
Figure 727
Figure 728
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