Beta Marine Beta 50 Operator's Maintenance Manual page 51

Problem
Oil pressure showing normal operating pressure
(0.75 - 5 bar). Buzzer sounding and light illuminated.
Water temperature gauge showing 120°C/250°F.
This also applies to the B Panel with Murphy gauge
Water temperature gauge showing normal operating
temperature (85°C). Buzzer sounding and light illuminated.
This also applies to the B Panel with Murphy gauge
Water temperature gauge showing no movement,
light not illuminated, engine warm.
This also applies to the B Panel with Murphy gauge
Possible Cause and Solution
Engine warm:
• Incorrectly calibrated switching point for warning light,
adjust on rear of gauge to 0.5 bar (minimum adjustment
on gauge).
• If adjusted correctly and buzzer still sounding, faulty
switch gauge unit - replace.
Engine cold/cool:
• Faulty wiring, check water temperature sender wire is
not shorting to earth (ground).
• Faulty sender unit, - check resistance to earth, approx.
3.5k Ω (cold) – 0.5k Ω (warm). Replace if notably less.
Engine warm:
• Incorrectly calibrated switching point for warning
light adjust on rear of gauge to 100°C/210°F.
• If adjusted correctly and buzzer still sounding,
faulty switch gauge unit - replace.
• Check connection to sender, if disconnected gauge
will not function.
• Check connection to temperature gauge, if plug is
not connected to socket on rear of gauge reconnect.
If all connections are correctly made, faulty sender
unit - check resistance to earth, approx. 3.5k Ω
(cold) - 0.5k Ω (warm). Replace if no reading.
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