Measure battery voltage.
| Possible defect | Remedy |
|---|---|
| Voltage too low | Recharge battery if necessary |
Check fuel pump delivery quantity.
| Possible defect | Remedy |
|---|---|
| Delivery quantity too small due to | Change condition by |
Remove glow-spark plug and check glow element.
| Possible defect | Remedy |
|---|---|
| Open in glow element | Install new glow-spark plug |
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.
| Possible defect | Remedy |
|---|---|
| Thermo switch defective (cut-in time too short) | Install new thermo switch |