18
Fault finding
Fault Finding Chart
Please carry out checks as per the list below when faults occur. If you cannot rectify the fault,
contact Hoval Customer Services or your installer. Telephone number and e-mail address
are shown on the rear cover.
Symptom
Possible Cause
Action
A. Primary Water
Circuit Inefficient
(1) Leakage in system.
(2) Pump faulty or inoperative.
(3) Boiler faulty or inoperative.
(4) Circuit not properly vented.
(5) Pump not of sufficient duty.
(1) Check pipe connection. Renew
if required.
(2) Refer to appropriate pump part
document.
(3) Refer to appropriate boiler part
document.
(4) Vent primary system.
(5) Change pump speed or pump.
Symptom
Possible Cause
Action
A. Secondary water
temperature not as
setting on thermostat.
(1) Leakage in system.
(2) Pump faulty or inoperative.
(3) Thermostat faulty.
(4) Electrical fault in control system.
(5) Calorifier scaled up.
(6) Calorifier not large enough for load
imposed.
(7) Low primary temperature.
(8) Diverting valve bypassing.
(1) Check pipe connection. Renew
if required.
(2) Refer to appropriate pump part
document.
(3) Check and replace if required.
(4) Refer to appropriate control sys-
tem part document.
(5) Mechanically / chemically de-
scale as necessary.
(6) Change calorifier or add calorifi-
er / buffer vessel.
(7) Turn up boiler thermostats / in-
crease primary flow rate.
(8) Check primary pipe cools when
hot.Water not required.
