HWP30N/HWP40N Forced Circulation Heater User Manual Page 12 of 14
Common Faults and Solutions:
1. Overheat protection:
a. Check the valve to assure whether it is opened and whether the heater is full of water;
b. Check whether the hosepipe has an obvious W-shaped or reverse U-shaped trend, and whether there
is an obvious hot and cold alternating area.
Solutions:
Shorten the hosepipe length and optimize the hosepipe trend.
2. High water outlet temperature:
It occurs when the hosepipe is too long, both the inner diameter of
the hosepipe and the inner diameter of the fitting joints are too small, as well as the water flow is not
smooth so that the heat cannot be transferred properly.
Solutions:
Shorten the hosepipe length, using the hose with an inner diameter of more than 20mm, and
the connectors with an inner diameter of more than 15mm.
3. Cannot reach the preheating temperature:
a. The heater power is not enough;
b. The cable of the power supply is too long and result in dividing resistance of the cable.
Solutions:
1. Replace the heater whose power matches the engine;
2. Shorten the power cable as possible and increase the cable diameter.
