Troubleshooting - Waeco Mobitherm MWH-020/N Installation And Operating Manual

MWH-20-N_60-N_EB_10s.book Seite 35 Montag, 5. Februar 2007 5:57 17
Mobitherm
12

Troubleshooting

The engine does not heat the water.
➤ Make sure there is no air in the engine circuit of the water heater.
If there is air in it, open the air nipple (if fitted) or the connections on the
water heater (red rubber ring) and let the air out.
➤ Check that the temperature of the engine cooling water is above 50 °C.
➤ Check if the water is circulating.
➤ Check that the connections to the taps are tight.
The heating cartridge does not heat the water.
Caution
e
Always take out the power plug before taking off the plastic cover.
➤ Check if there is power.
➤ Make sure the water heater is suitable for the voltage applied.
➤ Check if the thermostat control is working properly, and switches on and
off.
➤ Make sure the automatic fuse of the thermostat has not blown.
If the fuse has blown, reset it (see chapter „Resetting the overheating
protection device" on page 33):
If the water gets very hot and the fuse blows again, have the thermostat
and the heating cartridge inspected and if necessary replaced.
Caution
a
Always call a specialist to inspect and replace the thermostat and
heating cartridge.
➤ Take off the black plastic cover above the electrical connections and
check for traces of lime deposits.
Clean the connections when necessary.
➤ Check that the connections to the taps are tight.
Troubleshooting
35