Boiler type Q175SN
Error code E02
Cause:
No flame formation
1. No temperature difference between supply (3) and return (4)
2. There is a temperature difference between supply (3) and return (4)
Solution:
Check the data in Error mode. Boiler data during error.
1 error = 02
2 operational status = 02
3 supply temp. = xx*
4 return temp. = xx*
5 kW burner = xx**
6 % pump = xx*
* = variable value
**= x 3451 = BTU/hr
1. Boiler has not been able to ignite any gas or has not received any gas. Boiler tries to start 6 times with an increasing starting load after the safety time.
Check whether:
- the gas valve is open;
- there is power to the gas valve;
- that the gas valve opens
The minimum gas pre-pressure during the start must be a minimum of 7"W.C.
(17 mbar), check the 24 Volts in the gas during ignition block’s open position
2. Boiler has gone out after ignition. Due to insuffi cient ionization the burner
has gone out after ignition
Ionization flow, ionization cable or the O2 setting. The minimum ionization
current should be 4 μA, the O2 schould be a minimum of 4.4% for NG or 4.8%
for LP
