Quietside not heating up house

For the past few days my Quietside DPW-120 has not been able to get the heat above 61* in either zone of my two zone house.. Both thermostats are set to heat to 68*, both indicate they are attempting to apply heat but while baseboard heaters are warm they are not pushing much heat.



Power is on to the quietside unit is on, control unit has heating water set to 176*, burner light comes on, heats water to 176*, temp drops down to about 150* in about 30 seconds time and then burner comes back on and process i repeated.



Taco zvc403 shows orange lights on zone 1 and 2 thermostat, red lights on zone valve, green power



Taco SR 501 shows zone 1 red.



As you can probably tell I don't know much about the system or how to troubleshoot, I just did my best at describing the situation. Would like to know if there is any way to narrow down the scope of this issue or if I am better off calling in a service tech.



Thanks.