Potterton
Puma range
| Problem | Solution |
| No heating | dripping hot water tap can prevent heating from coming on. Juts a small drip will prevent the wax capsule diverter valve from opening up and sending heat around the radiators |
| Overheating/red lockout light | hot water microswitch can stick on, checkbrass hot water flow switch, may have leaked onto spindle and caused it to stick on, change both where required |
| low pressure nor clearing | low pressure switch prone to blocking, drain and clear with a ball ended allen key to stop damage to switch, also clear where it screws into boiler |
| excessive pressure with heating running | expansion vessel hose prone to blocking, drain and unblock with a suitable implement, (such as wire coat hanger) |
| low water pressure switch | there is one switch that fits all pumas but check connections, 1 and 3 for the Electronic non pilot versions (80e and 100e), and 1 and 2 for the pilot versions 80 and 100. |
| noisy ignition | check correct PCB is fitted as pilot model may be fitted to electronic model giving full gas on ignition |
| total fail | neutral connection at top left of modulation (front) PCB can fail meaning no power to boiler. Sometimes burning smell and sizzling noises can be experienced |
| no heating | again, check for dry joints on back of modulation PCB |
| low flow rate from taps | There is a wax capsule assembly in the temperature limiter. This restricts the water until its warm. The wax capsule may be brittle and not fully opening. Requires a new temperature limiter where necesarry. |