Heater does not work at low outside temperature¶
Step 1: Battery¶
Measure battery voltage.
|Voltage too low||Recharge battery if necessary|
Step 2: Fuel pump¶
Check fuel pump delivery quantity.
|Delivery quantity too small due to||Change condition by|
Step 3: Glow-spark plug¶
Remove glow-spark plug and check glow element.
|Open in glow element||Install new glow-spark plug|
Step 4: Thermo switch¶
Connect voltmeter to terminal NO of safety switch and to ground, then turn heater on with engine cold. Voltage must be held for at least 70 seconds.
|Thermo switch defective (cut-in time too short)||Install new thermo switch|